Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Oct. 01, 2016	Nov. 01, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 01, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Trading Symbol	ULH
Entity Registrant Name	Universal Logistics Holdings, Inc.
Entity Central Index Key	0001308208
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		28,412,746

Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 1,544	$ 12,930
Marketable securities	13,786	13,431
Accounts receivable – net of allowance for doubtful accounts of $4,903 and $5,173, respectively	149,096	141,275
Other receivables	13,180	15,422
Due from affiliates	2,818	1,924
Prepaid income taxes	3,379
Prepaid expenses and other	19,814	17,858
Total current assets	203,617	202,840
Property and equipment – net of accumulated depreciation of $176,852 and $171,815, respectively	236,499	177,189
Goodwill	74,484	74,484
Intangible assets – net of accumulated amortization of $49,114 and $43,495, respectively	39,046	44,665
Deferred income taxes	63	83
Other assets	4,522	3,894
Total assets	558,231	503,155
Current liabilities:
Accounts payable	73,027	46,347
Due to affiliates	6,558	3,413
Accrued expenses and other current liabilities	21,105	18,989
Insurance and claims	19,061	21,906
Income taxes payable		1,045
Current portion of long-term debt, net of debt issuance costs of $321 and $264, respectively	32,333	61,224
Current portion of affiliate note	2,614
Current maturities of capital lease obligations	108	916
Total current liabilities	154,806	153,840
Long-term liabilities:
Long-term debt, net of debt issuance costs of $1,347 and $1,235, respectively	213,934	172,190
Long-term portion of affiliate note	43
Capital lease obligations, net of current maturities	115	1,065
Deferred income taxes	40,155	40,496
Other long-term liabilities	3,235	4,483
Total long-term liabilities	257,482	218,234
Shareholders' equity:
Common stock, no par value. Authorized 100,000,000 shares; 30,900,304 and 30,884,727 shares issued; 28,412,746 and 28,398,900 shares outstanding, respectively	30,900	30,885
Paid-in capital	3,196	2,914
Treasury stock, at cost; 2,487,558 and 2,485,827 shares, respectively	(50,044)	(50,018)
Retained earnings	165,299	149,743
Accumulated other comprehensive income (loss):
Unrealized holding gain on available-for-sale securities, net of income taxes of $(1,249) and $(1,015), respectively	2,215	1,801
Interest rate swaps, net of income taxes of $238 and $0, respectively	(389)
Foreign currency translation adjustments	(5,234)	(4,244)
Total shareholders’ equity	145,943	131,081
Total liabilities and shareholders’ equity	$ 558,231	$ 503,155

Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Oct. 01, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 4,903	$ 5,173
Property and equipment, Accumulated depreciation	176,852	171,815
Intangible assets, accumulated amortization	49,114	43,495
Debt issuance cost current	321	264
Debt issuance cost non current	$ 1,347	$ 1,235
Common stock, par value
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	30,900,304	30,884,727
Common stock, shares outstanding	28,412,746	28,398,900
Treasury stock, shares	2,487,558	2,485,827
Income tax expense on unrealized holding gain on available-for-sale securities	$ 1,249	$ 1,015
Interest rate swaps, income taxes	$ 238	$ 0

Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Operating revenues:
Transportation services	$ 163,587	$ 178,114	$ 476,235	$ 518,668
Value-added services	71,956	68,400	225,716	213,723
Intermodal services	35,950	37,700	106,749	110,391
Total operating revenues	271,493	284,214	808,700	842,782
Operating expenses:
Purchased transportation and equipment rent	131,832	146,687	385,509	427,852
Direct personnel and related benefits	65,257	54,116	194,615	159,374
Commission expense	8,217	9,651	24,668	28,012
Operating expenses (exclusive of items shown separately)	24,973	25,483	72,465	81,624
Occupancy expense	8,075	6,739	23,772	20,173
Selling, general, and administrative	9,087	9,452	26,576	27,724
Insurance and claims	4,949	6,598	13,607	16,643
Depreciation and amortization	9,076	8,544	26,757	26,449
Total operating expenses	261,466	267,270	767,969	787,851
Income from operations	10,027	16,944	40,731	54,931
Interest income	15	12	141	37
Interest expense	(2,093)	(2,090)	(6,297)	(5,858)
Other non-operating income	170	135	420	807
Income before provision for income taxes	8,119	15,001	34,995	49,917
Provision for income taxes	3,122	5,754	13,474	19,222
Net income	$ 4,997	$ 9,247	$ 21,521	$ 30,695
Earnings per common share:
Basic	$ 0.18	$ 0.32	$ 0.76	$ 1.04
Diluted	$ 0.18	$ 0.32	$ 0.76	$ 1.04
Weighted average number of common shares outstanding:
Basic	28,413	28,661	28,410	29,537
Diluted	28,413	28,661	28,410	29,541
Dividends declared per common share	$ 0.07	$ 0.07	$ 0.21	$ 0.21

Unaudited Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 4,997	$ 9,247	$ 21,521	$ 30,695
Other comprehensive income (loss):
Unrealized holding gains (losses) on available-for-sale securities arising during the period, net of income taxes	(147)	(1,098)	467	(1,106)
Realized gains on available-for-sale securities reclassified into income, net of income taxes	(29)		(53)	(176)
Unrealized changes in fair value of interest rate swaps, net of income taxes	45		(389)
Foreign currency translation adjustments	(293)	(987)	(990)	(1,753)
Total other comprehensive loss	(424)	(2,085)	(965)	(3,035)
Total comprehensive income	$ 4,573	$ 7,162	$ 20,556	$ 27,660

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015
Cash flows from operating activities:
Net Income	$ 21,521	$ 30,695
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,757	26,449
Gain on sale of marketable securities	(53)	(276)
(Gain) loss on disposal of property and equipment	(353)	295
Amortization of debt issuance costs	227	530
Stock-based compensation	298	173
Provision for doubtful accounts	1,369	2,017
Deferred income taxes	(251)	(1,569)
Change in assets and liabilities:
Trade and other accounts receivable	(6,558)	(16,878)
Prepaid income taxes, prepaid expenses and other assets	(5,962)	1,526
Accounts payable, accrued expenses and other current liabilities, and insurance and claims	23,608	4,067
Due to/from affiliates, net	2,251	1,781
Other long-term liabilities	(1,912)	(318)
Net cash provided by operating activities	60,942	48,492
Cash flows from investing activities:
Capital expenditures	(78,651)	(13,377)
Proceeds from the sale of property and equipment	2,225	505
Purchases of marketable securities	(13)	(1,150)
Proceeds from sale of marketable securities	358	322
Net cash used in investing activities	(76,081)	(13,700)
Cash flows from financing activities:
Proceeds from borrowing - revolving	140,494	101,080
Repayments of borrowings - revolving	(150,129)	(80,450)
Proceeds from borrowing - term	85,313
Repayments of borrowings - term	(63,657)	(10,073)
Payment of capital lease obligations	(1,758)	(810)
Dividends paid	(5,965)	(6,184)
Capitalized financing costs	(396)	(76)
Purchases of treasury stock	(26)	(35,065)
Net cash provided by (used in) financing activities	3,876	(31,578)
Effect of exchange rate changes on cash and cash equivalents	(123)	(1,025)
Net increases (decrease) in cash	(11,386)	2,189
Cash and cash equivalents – beginning of period	12,930	8,001
Cash and cash equivalents – end of period	1,544	10,190
Supplemental cash flow information:
Cash paid for interest	5,724	5,230
Cash paid for income taxes	18,398	$ 20,534
Non-cash investing and financing activities
Non-cash capital expenditures pursuant to promissory note.	$ 3,700

Basis of Presentation

9 Months Ended

Oct. 01, 2016

Accounting Policies [Abstract]

Basis of Presentation

(1)	Basis of Presentation

The accompanying unaudited consolidated financial statements of Universal Logistics Holdings, Inc., formerly known as Universal Truckload Services, Inc., and its wholly-owned subsidiaries (“we”, “us”, “our”, “Universal”, or “the Company”), have been prepared by the Company’s management. In the opinion of management, the unaudited consolidated financial statements include all normal recurring adjustments necessary to present fairly the information required to be set forth therein. Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted from these statements pursuant to such rules and regulations and, accordingly, should be read in conjunction with the consolidated financial statements as of December 31, 2015 and 2014 and for each of the years in the three-year period ended December 31, 2015 included in the Company’s Form 10-K filed with the Securities and Exchange Commission. The preparation of the consolidated financial statements requires the use of management’s estimates. Actual results could differ from those estimates.

Our fiscal year ends on December 31 and consists of four quarters, each with thirteen weeks.

Certain immaterial reclassifications have been made to the prior financial statements in order for them to conform to the October 1, 2016 presentation. Such reclassifications had no impact on previously reported net income.

Marketable Securities

9 Months Ended

Oct. 01, 2016

Investments Debt And Equity Securities [Abstract]

Marketable Securities

(2)	Marketable Securities

We may, from time to time, invest cash in excess of our current needs in marketable securities, much of which is held in equity securities, which are actively traded on public exchanges. It is our philosophy to minimize the risk of capital loss without foregoing the potential for capital appreciation through investing in value-and-income oriented investments. However, holding equity securities subjects us to fluctuations in the market value of our investment portfolio based on current market prices, and a decline in market prices or other unstable market conditions could cause a loss in the value of our marketable securities classified as available-for-sale.

At October 1, 2016 and December 31, 2015, marketable securities, all of which are available-for-sale, consist of common and preferred stocks. Marketable securities are carried at fair value, with unrealized gains and losses, net of related income taxes, reported as accumulated other comprehensive income, except for losses from impairments which are determined to be other-than-temporary. Realized gains and losses, and declines in value judged to be other-than-temporary on available-for-sale securities are included in the determination of net income and are included in other non-operating income (expense), at which time the average cost basis of these securities are adjusted to fair value. Fair values are based on quoted market prices at the reporting date. Interest and dividends on available-for-sale securities are included in other non-operating income (expense).

The cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities by type were as follows (in thousands):

	Cost		Gross unrealized holding gains		Gross unrealized holding (losses)			Fair Value
At October 1, 2016
Equity Securities	$	10,322	$	4,250	$	(786	)	$	13,786

At December 31, 2015
Equity Securities	$	10,614	$	3,958	$	(1,141	)	$	13,431

Included in equity securities at October 1, 2016 are securities with a fair value of $3.1 million with a cumulative loss position of $0.8 million, the impairment of which we consider to be temporary. We consider several factors in our determination as to whether declines in value are judged to be temporary or other-than-temporary, including the severity and duration of the decline, the financial condition and near-term prospects of the specific issuers and the industries in which they operate, and our intent and ability to hold these securities. We may incur future impairment charges if declines in market values continue and/or worsen and impairments are no longer considered temporary.

(2)	Marketable Securities - continued

The fair value and gross unrealized holding losses of our marketable securities that are not deemed to be other-than-temporarily impaired aggregated by type and length of time they have been in a continuous unrealized loss position were as follows (in thousands):

	Less than 12 Months				12 Months or Greater				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
At October 1, 2016
Equity securities	$	908	$	163	$	2,220	$	623	$	3,128	$	786

At December 31, 2015
Equity securities	$	3,099	$	987	$	345	$	154	$	3,444	$	1,141

Our portfolio of equity securities in a continuous loss position, the impairment of which we consider to be temporary, consists primarily of common stocks in the oil and gas, banking, communications, and transportation industries. The fair value and unrealized losses are distributed in 29 publicly traded companies, with no single industry or company representing a material or concentrated unrealized loss. We have evaluated the near-term prospects of the various industries, as well as the specific issuers within our portfolio, in relation to the severity and duration of the impairments, and based on that evaluation, as well as our ability and intent to hold these investments for a reasonable period of time to allow for a recovery of fair value, we do not consider these investments to be other-than-temporarily impaired at October 1, 2016.

Accrued Expenses and Other Current Liabilities

9 Months Ended

Oct. 01, 2016

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

(3)	Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities is comprised of the following (in thousands):

	October 1, 2016		December 31, 2015

Payroll related items	$	9,457	$	6,833
Driver escrow liabilities		4,129		4,486
Commissions, taxes and other		7,519		7,670
Total	$	21,105	$	18,989

Debt

9 Months Ended

Oct. 01, 2016

Debt Disclosure [Abstract]

Debt

(4)

Debt

Debt is comprised of the following (in thousands):

	Interest Rates at October 1, 2016		October 1, 2016		December 31, 2015
Outstanding Debt:
PNC $120 million revolving credit facility
LIBOR rate advance		2.03%	$	58,000	$	55,000
Domestic rate advance		4.00%		2,700		4,569
Key Equipment credit agreement		3.75%		68,436		83,578
Comerica syndicated credit facility
$40 million term loan		3.02%		35,500		40,000
$20 million revolving credit facility
LIBOR rate advance		2.52%		1,000		6,000
PRIME rate advance	NA			—		5,766
Flagstar $40 million unsecured term loan	NA			—		40,000
Real estate notes
Flagstar real estate notes		2.71%		50,937		—
Crown real estate note		3.50%		2,657		—
Equipment notes	3.24% to 3.69%			31,362		—
UBS secured borrowing facility		1.63%		—		—
				250,592		234,913
Less current portion				35,268		61,488
Total long-term debt			$	215,324	$	173,425

December 2015 Debt Refinancing

On December 23, 2015, Universal and certain of its wholly-owned subsidiaries entered into a combination of secured and unsecured loans with certain lenders. The Company undertook the action as part of its ongoing organizational streamlining efforts to better align sources of capital used in its asset-light businesses and to fix a portion of its variable interest rate bearing debt. Upon closing, the Company and subsidiaries involved borrowed approximately $234.9 million to pay off existing indebtedness, to terminate its previous syndicated Comerica Bank Revolving Credit and Term Loan Agreement, and to pay fees and expenses associated with the new credit agreements.

At October 1, 2016 and December 31, 2015, long-term debt and current maturities of long-term debt are presented net of debt issuance cost totaling $1.7 million and $1.5 million, respectively, in our Consolidated Balance Sheets.

PNC $120 million Revolving Credit Facility

Universal Truckload, Inc., Universal Dedicated, Inc., Mason Dixon Intermodal, Inc., Logistics Insight Corp., Universal Logistics Solutions International, Inc., Universal Specialized, Inc., Cavalry Logistics, LLC and Universal Management Services, Inc., (each a wholly-owned subsidiary of the Company, a “Borrowing Subsidiary” and, collectively, the “Borrowing Subsidiaries”) entered into a Revolving Credit and Security Agreement with PNC Bank, National Association (“PNC”) to provide for a revolving credit facility of up to $120 million (which amount may be increased by up to $30 million upon request). Borrowings under the revolving credit facility may be made until, and mature on, December 23, 2020.

To support daily borrowing and other operating requirements, the revolving credit facility contains a $10.2 million Swing Loan sub-facility and provides for $3.0 million in letters of credit. There were no amounts outstanding under the Swing Loan sub-facility at October 1, 2016 and December 31, 2015, and no letters of credit were issued against the line.

(4)	Debt - continued

Borrowings under the Revolving Credit and Security Agreement bear interest at LIBOR or a base rate, plus an applicable margin for each. The applicable margin fluctuates based on the Borrowing Subsidiaries’ quarterly average excess availability, as defined in the Revolving Credit and Security Agreement. Interest on the unpaid balance of all base rate advances is payable quarterly in arrears on the first day of each calendar quarter. Interest on the unpaid balance of each LIBOR based advance of the revolving credit facility is payable on the last day of the applicable LIBOR interest period. At October 1, 2016, interest on a $58.0 million LIBOR rate advance accrued at 2.03% based on 30-day LIBOR plus 1.50%, and interest on a $2.7 million domestic rate advance accrued at 4.0% based on PNC’s prime rate plus 0.50%.

The Revolving Credit and Security Agreement includes customary affirmative and negative covenants and events of default, as well as financial covenants requiring a minimum fixed charge coverage ratio to be maintained after a triggering event, as defined in the Revolving Credit and Security Agreement. The Revolving Credit and Security Agreement also includes customary mandatory prepayments provisions and is subject to an unused revolving credit line fee of 0.25%. At October 1, 2016, we were in compliance with the debt covenants.

As security for all indebtedness pursuant to the Revolving Credit and Security Agreement, PNC was granted a first priority perfected security interest in cash, deposits and accounts receivable of the Borrowing Subsidiaries and selected other assets. At October 1, 2016, our $60.7 million revolver advance was secured by, among other assets, net eligible accounts receivable totaling $98.5 million. At October 1, 2016, availability, as defined in the Revolving Credit and Security Agreement, was $28.0 million.

Key Equipment Credit Agreement

LGSI Equipment of Indiana, LLC, a wholly-owned subsidiary of the Company (the “Equipment Borrowing Subsidiary”), entered into a Master Security Agreement and five Promissory Notes (collectively the “Equipment Credit Agreement”) with Key Equipment Finance, a division of KeyBank National Association (“KeyBank”). Under the Equipment Credit Agreement, the Equipment Borrowing Subsidiary borrowed approximately $83.6 million. The promissory notes are being paid in 60 monthly installments, including interest, beginning on January 23, 2016 and bear interest at a fixed rate of 3.75%.

Additionally, all obligations under the Equipment Credit Agreement are guaranteed by Universal Dedicated, Inc., Logistics Insight Corp., Universal Truckload, Inc., Universal Specialized, Inc. and Mason Dixon Intermodal, Inc. (each a wholly-owned subsidiary of the Company) in connection with each subsidiary’s lease of equipment. The Equipment Credit Agreement also includes financial covenants requiring the Equipment Borrowing Subsidiary to maintain a ratio of operating cash flow to fixed charges of not less than 1.1:1, as defined in the agreement. At October 1, 2016, we were in compliance with the debt covenants.

As security for all indebtedness pursuant to the Equipment Credit Agreement, KeyBank was granted liens on selected titled vehicles of the Equipment Borrowing Subsidiary set forth on various collateral schedules. The Equipment Borrowing Subsidiary may sell or dispose of equipment secured under the Equipment Credit Agreement provided the disposed equipment is replaced with acceptable equipment as collateral, if we pay down of a portion of the loan plus breakage charges and handling charges, as defined in the promissory notes, or if KeyBank, at its option, releases the equipment without pay down or pre-payment. At October 1, 2016, the aggregate principal outstanding pursuant to the five promissory notes totaled $68.4 million.

(4)	Debt - continued

Comerica Syndicated Credit Facility

Westport Axle Corp., a wholly-owned subsidiary of the Company (“Westport”), entered into a Revolving Credit and Term Loan Agreement (the “Credit Agreement”), with and among the lenders party thereto and Comerica Bank, as administrative agent, arranger and documentation agent, providing for aggregate borrowing facilities of up to $60 million. The Credit Agreement consists of a $40 million term loan and a $20 million revolving credit facility. Borrowings under the term loan were advanced on December 23, 2015 and mature on December 23, 2020. The term loan shall be repaid in 20 equal quarterly installments of $1.5 million over five years beginning March 1, 2016, with the remaining balance due at maturity. Borrowings under the revolving credit facility may be made until, and mature on, December 23, 2020.

Borrowings under the Credit Agreement bear interest at LIBOR or a base rate, plus an applicable margin for each. The applicable margin fluctuates based on Westport’s total debt to EBITDA ratio, as defined in the Credit Agreement. At October 1, 2016, interest on the $35.5 million term loan accrued at 3.02% based on 30-day LIBOR plus 2.50%, and interest on the $1.0 million LIBOR rate revolving credit advance accrued at 2.52% based on 30-day LIBOR plus 2.00%.

To support daily borrowing and other operating requirements, the revolving credit facility contains a $4.0 million Swing Line sub-facility and provides for $2.0 million in letters of credit. Swing Line borrowings incur interest at either the base rate plus the applicable margin or, alternatively, at a quoted rate offered by Comerica Bank in its sole discretion. There were no amounts outstanding under the Swing Line at October 1, 2016 and December 31, 2015, and no letters of credit were issued against the line.

Interest on the unpaid balance of all revolving credit facility and swing line base rate advances is payable quarterly in arrears commencing on March 1, 2016, and on the first day of each June, September, December and March thereafter. Interest on the unpaid balance of each Eurodollar-based advance of the revolving credit facility is payable on the last day of the applicable Eurodollar interest period. Interest on the unpaid balance of each quoted rate based advance of the swing line is payable on the last day of the applicable quoted rate interest period.

Interest on the unpaid principal of all term loan base rate advances is payable quarterly in arrears commencing on January 1, 2016, and on the first day of each April, July, October and January thereafter. Interest on the unpaid principal of each Eurodollar-based advance of the term loan is payable on the last day of the applicable Eurodollar interest period.

The revolving credit facility is subject to a facility fee, which is payable quarterly in arrears, of either 0.25% or 0.50%, depending on Westport’s ratio of total debt to EBITDA. Other than in connection with Eurodollar-based advances or quoted rate advances that are paid off and terminated prior to an applicable interest period, there are no premiums or penalties resulting from prepayment. Borrowings outstanding at any time under the revolving credit facility are limited to the value of eligible accounts receivable and inventory of Westport, pursuant to a monthly borrowing base certificate. At October 1, 2016, our $1.0 million revolver advance was secured by, among other assets, net eligible accounts receivable and inventory of $10.5 million and $6.5 million, respectively. At October 1, 2016, availability, as defined in the Credit Agreement, was $11.5 million.

The Credit Agreement requires Westport to repay the borrowings made under the term loan and the revolving credit facility as follows: 50% (which percentage shall be reduced to zero subject to Westport attaining a certain leverage ratio) of Westport’s annual excess cash flow, as defined; 100% of the net cash proceeds if we sell Westport’s machining division; 50% of net proceeds from certain equity issuances; 100% of proceeds from the issuance of certain indebtedness; and 100% of net proceeds from the sale of certain assets, insurance and condemnation proceeds.

(4)	Debt - continued

As security for all indebtedness pursuant to the syndicated Credit Agreement, Comerica Bank, as lead arranger, was granted first perfected security interest on all of Westport’s tangible and intangible property and in assets acquired in the future. The Company also pledged 100% of its equity interest in Westport. The Credit Agreement also contains a “springing” guaranty requiring the Company to guarantee the indebtedness under certain events, as defined in the Credit Agreement and guarantee.

The Credit Agreement includes financial covenants requiring Westport to maintain a minimum fixed charge coverage ratio, minimum quarterly EBITDA amounts, as defined in the Credit Agreement, and a maximum debt to EBITDA ratio, as well as customary affirmative and negative covenants and events of default. At October 1, 2016, Westport was in compliance with the debt covenants.

Flagstar $40 million Unsecured Term Loan

The Company entered into a Loan and Financing Agreement (the “Loan Agreement”) with Flagstar Bank, F.S.B. (“Flagstar”) to provide for a $40.0 million unsecured term loan. Proceeds of the unsecured term loan were advanced on December 23, 2015, and the outstanding principal balance was due on or before July 15, 2016. Borrowings under the unsecured term loan bore interest at LIBOR, plus 3.5%, and interest on the unpaid balance was payable monthly commencing on February 1, 2016. On June 21, 2016, UTSI Finance, Inc. (“UTSI Finance”), a wholly-owned subsidiary of the Company, borrowed approximately $32.8 million to refinance a portion of the Company’s existing indebtedness with Flagstar pursuant to the $40 million unsecured term loan. At October 1, 2016, the outstanding principal balance was $0.

Real Estate Notes

On June 21, 2016, UTSI Finance, entered into a Loan and Financing Agreement with Flagstar, along with ten accompanying promissory notes and commercial mortgages (collectively, the “Real Estate Credit Agreement”). Under the Real Estate Credit Agreement, UTSI Finance borrowed approximately $32.8 million to refinance a portion of the Company’s existing indebtedness with Flagstar pursuant to its $40 million unsecured term loan. The promissory notes bear interest at a rate of LIBOR plus 2.25%, and will be repaid in consecutive monthly installment payments of principal and accrued interest beginning July 1, 2016. The promissory notes are due on or before June 30, 2026.

(4)	Debt - continued

As security for all indebtedness pursuant to the Real Estate Credit Agreement, Flagstar was granted first mortgages and assignment of leases on specific parcels of real estate and improvements included in the collateral pool, as defined in the agreement. Except for obligations subject to interest rate swap agreements with Flagstar, as defined in the Real Estate Credit Agreement, UTSI Finance may prepay all or a portion of the loans, plus applicable breakage charges and fees.

On September 6, 2016, UTSI Finance entered into an additional loan and financing agreement with Flagstar, along with a promissory note and commercial mortgage (collectively, the “Secured Note”). Under the Secured Note, Flagstar loaned UTSI Finance $19.0 million in order to repay a portion of an unsecured promissory note in the principal amount of $22.5 million dated August 8, 2016 (the “Unsecured Note”) issued to an affiliate, Crown Enterprises, Inc. (“Crown”), in connection with the purchase of a terminal. The Unsecured Note is payable in 120 monthly payments of principal and accrued interest starting September 15, 2016, and bears interest at a fixed rate of 3.5% per annum. UTSI Finance may prepay the Unsecured Note at any time, in whole or in part, without premium or penalty. As of October 1, 2016, the remaining principal balance on the Unsecured Note with Crown was approximately $2.7 million, and such amount is due on or before August 15, 2026. See Note 6 for additional information pertaining to the terminal purchase.

The Secured Note bears interest at a rate of LIBOR plus 2.25%, and will be repaid in consecutive monthly installment payments of principal and accrued interest beginning October 1, 2016. The Secured Note matures on September 5, 2026. UTSI Finance granted to Flagstar a first priority mortgage on the terminal pursuant to the mortgage as security under the Secured Note. Except for obligations subject to any interest rate swap agreement, UTSI Finance may prepay all or a portion of the Secured Note, plus applicable breakage charges and fees.

The Flagstar real estate notes contain customary affirmative and negative covenants and events of default, and requires UTSI Finance to maintain a debt service coverage ratio of not less than 1.02:1. The first test for compliance is due after the fourth quarter of 2016. As of October 1, 2016, the aggregate principal outstanding pursuant to all Flagstar real estate notes was $50.9 million and interest accrued at 2.71%.

Equipment Notes

During the thirty-nine weeks ended October 1, 2016, a wholly-owned subsidiary of the Company entered into installment obligations totaling approximately $33.6 million for the purpose of purchasing revenue equipment. The promissory notes will be repaid in 60 monthly installments at interest rates ranging from 3.24% to 3.69%. At October 1, 2016, the aggregate principal outstanding pursuant to the promissory notes totaled $31.4 million.

UBS Secured Borrowing Facility

We also maintain a secured borrowing facility at UBS Financial Services, Inc., or UBS, using our marketable securities as collateral for the short-term line of credit. The line of credit bears an interest rate equal to LIBOR plus 1.10% (effective rate of 1.63% at October 1, 2016), and interest is adjusted and billed monthly. No principal payments are due on the borrowing; however, the line of credit is callable at any time. The amount available under the line of credit is based on a percentage of the market value of the underlying securities. If the equity value in the account falls below the minimum requirement, we must restore the equity value, or UBS may call the line of credit. At both October 1, 2016 and December 31, 2015, there were no amounts outstanding under the line of credit, and the maximum available borrowings were $7.3 million and $7.4 million, respectively.

(4)	Debt - continued

Swap Agreements

The Company is party to two forward interest rate swap agreements that qualify for hedge accounting. The swap agreements were executed to fix a portion of the interest rates on its variable rate debt that have a combined notional amount of $15.7 million at October 1, 2016. Under the swap agreements, the Company receives interest at the one-month LIBOR rate plus 2.25%, and pays a fixed rate. The March 2016 forward swap (swap A) is effective October 2016, has a rate of 4.16% (amortizing notional amount of $10.0 million) and expires July 2026, and the March 2016 forward swap (swap B) is effective October 2016, has a rate of 3.83% (amortizing notional amount of $5.7 million) and expires May 2022. The Company is also party to a third interest rate swap agreement that qualifies for hedge accounting. The swap agreement was executed to fix a portion of its variable rate debt with a notional amount of $12.0 million and expires February 2018 (swap C). Under swap C, the Company receives interest at the one-month LIBOR rate, and pays a fixed rate of 0.78%. The fair value of the three swap agreements was a liability of $0.6 million at October 1, 2016. Since these swap agreements qualify for hedge accounting, the changes in fair value are recorded in other comprehensive income (loss), net of tax. See Note 5 for additional information pertaining to interest rate swaps.

Fair Value Measurements and Disclosures

9 Months Ended

Oct. 01, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements and Disclosures

(5)	Fair Value Measurements and Disclosures

FASB ASC Topic 820, “Fair Value Measurements and Disclosures”, defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date and expanded disclosures with respect to fair value measurements.

FASB ASC Topic 820 also establishes a three-level fair value hierarchy that prioritizes the inputs used to measure fair value. This hierarchy requires entities to maximize the use of observable inputs and minimize the use of unobservable inputs. The three levels of inputs used to measure fair value are as follows:

•

Level 1 — Quoted prices in active markets for identical assets or liabilities.

•

Level 2 — Observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets; quoted prices for identical or similar assets and liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data.

•

Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. This includes certain pricing models, discounted cash flow methodologies and similar techniques that use significant unobservable inputs.

(5)	Fair Value Measurements and Disclosures – continued

We have segregated all financial assets and liabilities that are measured at fair value on a recurring basis into the most appropriate level within the fair value hierarchy based on the inputs used to determine the fair value at the measurement date in the tables below (in thousands):

	October 1, 2016
	Level 1		Level 2			Level 3		Asset/(Liability) Fair Value Measurement
Assets
Cash equivalents	$	8	$	—		$	—	$	8
Marketable securities		13,786		—			—		13,786
Liabilities
Interest rate swaps		—		(627	)		—		(627	)
Total	$	13,794	$	(627	)	$	—	$	13,167

	December 31, 2015
	Level 1		Level 2		Level 3		Asset/(Liability) Fair Value Measurement
Assets
Cash equivalents	$	96	$	—	$	—	$	96
Marketable securities		13,431		—		—		13,431
Total	$	13,527	$	—	$	—	$	13,527

The valuation techniques used to measure fair value for the items in the tables above are as follows:

•

Cash equivalents – This category consists of money market funds which are listed as Level 1 assets and measured at fair value based on quoted prices for identical instruments in active markets.

•

Marketable securities – Marketable securities represent equity securities, which consist of common and preferred stocks, are actively traded on public exchanges and are listed as Level 1 assets. Fair value was measured based on quoted prices for these securities in active markets.

•

Interest rate swaps - The fair value of our interest rate swaps, as provided by a third party service provider, is determined using a methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The variable cash receipts (or payments) are based on the expectation of future interest rates (forward curves) derived from observed market interest rate curves. The fair value measurement also incorporates credit valuation adjustments to appropriately reflect both the Company’s nonperformance risk and the respective counterparty’s nonperformance risk.

Our revolving credit and term loan agreements, and real estate promissory notes with PNC, Comerica Bank and Flagstar consist of variable rate borrowings. We categorize borrowings under these credit agreements as Level 2 in the fair value hierarchy. The carrying value of these borrowings approximate fair value because the applicable interest rates are adjusted frequently based on short-term market rates.

For our equipment and real estate promissory notes with fixed rates, the fair values are estimated using discounted cash flow analyses, based on our current incremental borrowing rates for similar types of borrowing arrangements. We categorize borrowings under these credit agreements as Level 2 in the fair value hierarchy. The carrying value and estimated fair value of these promissory notes at October 1, 2016 is summarized as follows:

Carrying Value

Estimated Fair

Value

Equipment and real estate promissory notes

102,455

103,695

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Transactions with Affiliates

9 Months Ended

Oct. 01, 2016

Transactions with Affiliates

(6)	Transactions with Affiliates

Through December 31, 2004, we were a wholly-owned subsidiary of CenTra, Inc. On December 31, 2004, CenTra distributed all of our common stock to the shareholders of CenTra. Subsequent to our initial public offering in 2005, our majority shareholders retained and continue to hold a controlling interest in Universal. In the normal course of business, CenTra and affiliates of CenTra provide administrative support services to us, including legal, human resources, tax, and IT infrastructure services. The cost of these services is based on the actual or estimated utilization of the specific service.

In addition to the administrative support services described above, we purchase other services from affiliates. Following is a schedule of cost incurred for services provided by affiliates for the thirteen weeks and thirty-nine ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended				Thirty-nine Weeks Ended
	October 1, 2016		September 26, 2015		October 1, 2016		September 26, 2015

Administrative support services	$	548	$	881	$	1,906	$	2,374
Truck fuel, tolls and maintenance		619		1,012		1,864		1,622
Real estate rent and related costs		4,218		3,149		12,458		9,578
Insurance and employee benefit plans		12,496		13,374		34,802		37,358
Contracted transportation services		4		218		230		686
Total	$	17,885	$	18,634	$	51,260	$	51,618

CenTra charges us for the direct variable cost of maintenance, fueling and other operational support costs for services delivered at their trucking terminals that are geographically remote from our own facilities. Such activities are billed when incurred, paid on a routine basis, and reflect actual labor utilization, repair parts costs or quantities of fuel purchased. In connection with our transportation services, we also pay tolls and other fees for international bridge crossings to certain related entities which are under common control with CenTra.

A significant number of our transportation and logistics service operations are located at facilities leased from affiliates. At 31 facilities, occupancy is based on either month-to-month or contractual, multi-year lease arrangements which are billed and paid monthly. Leasing properties provided by an affiliate that owns a substantial commercial property portfolio affords us significant operating flexibility. However, we are not limited to such arrangements.

We purchase workers’ compensation, property and casualty, cargo, warehousing and other general liability insurance from an insurance company controlled by our majority shareholders. Our employee health care benefits and 401(k) programs are also provided by this affiliate.

Other services from affiliates, including leased real estate, insurance and employee benefit plans, and contracted transportation services, are delivered to us on a per-transaction-basis or pursuant to separate contractual arrangements provided in the ordinary course of business. At October 1, 2016 and December 31, 2015, amounts due to affiliates related to such services were $6.6 million and $3.4 million, respectively. In our Consolidated Balance Sheets, we record our insured claims liability and the related recovery from an affiliate insurance provider in insurance and claims, and other receivables. At October 1, 2016 and December 31, 2015, there were $7.7 million and $11.5 million, respectively, included in each of these accounts for insured claims.

We used an affiliate to provide real property improvements to us totaling $1.0 million during the thirty-nine weeks ended October 1, 2016, and also purchased $1.4 million of wheels and tires for new trailering equipment and an additional $0.2 million in revenue equipment components from an affiliate during the same period. During the thirty-nine weeks ended September 26, 2015, we purchased used snow removal equipment from an affiliate for $18,000.

On August 8, 2016, the Company entered into and closed on a purchase agreement with a subsidiary of CenTra, Crown Enterprises, Inc. (the “Seller”), for a multi-building, cross-dock logistics terminal located in Romulus, Michigan. The purchase price, which was established by an independent third party appraisal, was $22.5 million payable pursuant to a promissory note with the Seller. As of October 1, 2016, the remaining principal balance on the note was $2.7 million, and such amount is due on or before August 15, 2026. See Note 4 for additional information pertaining to the note with the Seller.

(6)	Transactions with Affiliates – continued

We periodically use the law firm of Sullivan Hincks & Conway to provide us legal services. Daniel C. Sullivan, a member of our Board, is a partner at Sullivan Hincks & Conway. Not included in the table above are amounts paid for legal services during the thirty-nine weeks ended September 26, 2015 of $1,400. No amounts were paid for legal services during the thirteen weeks or thirty-nine weeks ended October 1, 2016, or during the thirteen weeks ended September 26, 2015.

Services provided by Universal to Affiliates

We may assist our affiliates with selected transportation and logistics services in connection with their specific customer contracts or purchase orders. Following is a schedule of services provided to affiliates for the thirteen weeks and thirty-nine weeks ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended				Thirty-nine Weeks Ended
	October 1, 2016		September 26, 2015		October 1, 2016		September 26, 2015
Purchased transportation and equipment rent	$	284	$	10	$	626	$	191
Total	$	284	$	10	$	626	$	191

At October 1, 2016 and December 31, 2015, amounts due from affiliates were $2.8 million and $1.9 million, respectively.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References + Details

Comprehensive Income

9 Months Ended

Oct. 01, 2016

Equity [Abstract]

Comprehensive Income

(7)	Comprehensive Income

Comprehensive income includes the following (in thousands):

	Thirteen weeks ended						Thirty-nine Weeks Ended
	October 1, 2016			September 26, 2015			October 1, 2016			September 26, 2015
Unrealized holding gains (losses) on available-for-sale investments arising during the period:
Gross amount	$	(224	)	$	(1,707	)	$	739		$	(1,740	)
Income tax (expense) benefit		77			609			(272	)		634
Net of tax amount	$	(147	)	$	(1,098	)	$	467		$	(1,106	)

Realized (gains) losses on available-for-sale investments reclassified into income:
Gross amount	$	(52	)	$	—		$	(91	)	$	(276	)
Income tax expense (benefit)		23			—			38			100
Net of tax amount	$	(29	)	$	—		$	(53	)	$	(176	)

Unrealized holding gains (losses) on interest rate swaps arising during the period:
Gross amount	$	73		$	—		$	(627	)	$	—
Income tax benefit (expense)		(28	)		—			238			—
Net of tax amount	$	45		$	—		$	(389	)	$	—

Foreign currency translation adjustments	$	(293	)	$	(987	)	$	(990	)	$	(1,753	)

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Stock Based Compensation

9 Months Ended

Oct. 01, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Compensation

(8)	Stock Based Compensation

On April 23, 2014, our Board of Directors adopted the 2014 Amended and Restated Stock Incentive Plan, or the Plan. The Plan was approved by our shareholders at the 2014 Annual Meeting and became effective as of the date it was adopted by the Board of Directors. The Plan replaced our 2004 Stock Incentive Plan and carried forward the shares of common stock that remained available for issuance under the 2004 Stock Incentive Plan. The grants may be made in the form of stock options, restricted stock bonuses, restricted stock purchase rights, stock appreciation rights, phantom stock units, restricted stock units or unrestricted common stock. A grantee’s vesting may be accelerated under certain conditions, including retirement. Restricted stock awards currently outstanding under the 2004 Stock Incentive Plan will remain outstanding in accordance with the terms of that plan.

On December 23, 2015, the Company granted 50,000 shares of restricted stock to certain of its employees. The restricted stock grants have a grant date fair value of $14.93 per share, based on the closing price of the Company’s stock, of which 25% vested immediately, and an additional 25% will vest in three equal increments on each December 20 in 2016, 2017 and 2018.

On March 5, 2015, the Company granted an additional 10,000 shares of restricted stock to its Chief Executive Officer. The restricted stock grants vested 25% on March 5, 2015, and an additional 25% will vest on each anniversary of the grant through March 5, 2018, subject to continued employment with the Company. On April 29, 2015, the Company granted an additional 20,000 shares of restricted stock to the Chief Executive Officer. These restricted stock grants vested 25% on April 29, 2015, and an additional 25% will vest in three equal increments on each March 5 in 2016, 2017 and 2018. On February 24, 2016, the Company granted and additional 10,000 shares of restricted stock to the Chief Executive Officer. These restricted stock grants vested 25% on February 24, 2016, and an additional 25% will vest in three equal increments on each March 5 in 2017, 2018 and 2019.

On December 20, 2012, the Company granted 178,137 shares of restricted stock to certain of its employees. The restricted stock grants vested 20% on December 20, 2012, and an additional 20% will vest on each anniversary of the grant through December 20, 2016, subject to continued employment with the Company.

The following table summarizes the status of the Company’s non-vested shares and related information for the period indicated:

	Shares			Weighted Average Grant Date Fair Value
Non-vested at January 1, 2016		68,225		$	17.80
Granted		10,000		$	15.55
Vested		(15,577	)	$	19.13
Forfeited		—		$	—
Balance at October 1, 2016		62,648		$	17.11

During the thirty-nine weeks ended October 1, 2016 and September 26, 2015, the total grant date fair value of vested shares recognized as compensation costs was $0.3 million and $0.2 million respectively. As of October 1, 2016, there was approximately $1.1 million of total unrecognized compensation cost related to non-vested share-based compensation arrangements. That cost is expected to be recognized on a straight-line basis over the remaining vesting period. As a result, the Company expects to recognize stock-based compensation expense of $0.2 million during the remainder of 2016, and $0.4 million, $0.4 million, and $0.1 million in 2017, 2018, and 2019, respectively.

Earnings Per Share

9 Months Ended

Oct. 01, 2016

Earnings Per Share [Abstract]

Earnings Per Share

(9)	Earnings Per Share

Basic earnings per common share amounts are based on the weighted average number of common shares outstanding, excluding outstanding non-vested restricted stock. Diluted earnings per common share include dilutive common stock equivalents determined by the treasury stock method. In each of the thirteen weeks and thirty-nine weeks ended October 1, 2016, there were no weighted average non-vested shares of restricted stock included in the denominator for the calculation of diluted earnings per share. For the thirteen weeks and thirty-nine weeks ended September 26, 2015, there were 177 and 3,502 weighted average non-vested shares of restricted stock included in the denominator for the calculation of diluted earnings per share, respectively.

In each of the thirteen weeks and thirty-nine weeks ended October 1, 2016, 68,225 shares of non-vested restricted stock were excluded from the calculation of diluted earnings per share because such shares were anti-dilutive. No shares were excluded from the calculation of diluted earnings per share for the thirteen weeks or thirty-nine weeks ended September 26, 2015.

Dividends

9 Months Ended

Oct. 01, 2016

Text Block [Abstract]

Dividends

(10)

Dividends

On July 28, 2016, our Board of Directors declared a quarterly cash dividend of $0.07 per share of common stock, payable to shareholders of record at the close of business on August 8, 2016 and paid on August 18, 2016. Declaration of future cash dividends is subject to final determination by the Board of Directors each quarter after its review of our financial condition, results of operations, capital requirements, any legal or contractual restrictions on the payment of dividends and other factors the Board of Directors deems relevant.

Segment Reporting

9 Months Ended

Oct. 01, 2016

Segment Reporting [Abstract]

Segment Reporting

(11)	Segment Reporting

We report our financial results in two reportable segments, the transportation segment and the logistics segment, based on the nature of the underlying customer commitment and the types of investments required to support these commitments. This presentation reflects the manner in which management evaluates our operating segments, including an evaluation of economic characteristics and applicable aggregation criteria.

Operations aggregated in our transportation segment are associated with individual freight shipments coordinated by our agents, company-managed terminals and specialized services operations. In contrast, operations aggregated in our logistics segment deliver value-added services or transportation services to specific customers on a dedicated basis, generally pursuant to contract terms of one year or longer. Other non-reportable operating segments are comprised of the Company’s subsidiaries that provide support services to other subsidiaries and to owner-operators, including shop maintenance and equipment leasing.

The following tables summarize information about our reportable segments as of and for the thirteen week and thirty-nine week periods ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended October 1, 2016
	Transportation			Logistics			Other		Total
Operating revenues	$	169,655		$	101,110		$	728	$	271,493
Eliminated inter-segment revenues		(527	)		(1,966	)		—		(2,493	)
Income from operations		4,577			5,360			90		10,027
Total assets		241,540			295,583			21,108		558,231

	Thirteen weeks ended September 26, 2015
	Transportation			Logistics			Other			Total
Operating revenues	$	186,927		$	97,179		$	108		$	284,214
Eliminated inter-segment revenues		(662	)		(1,841	)		—			(2,503	)
Income from operations		8,086			10,129			(1,271	)		16,944
Total assets		233,791			256,110			37,961			527,862

	Thirty-nine weeks ended October 1, 2016
	Transportation			Logistics			Other			Total
Operating revenues	$	496,488		$	310,896		$	1,316		$	808,700
Eliminated inter-segment revenues		(1,471	)		(5,967	)		—			(7,438	)
Income from operations		17,384			24,517			(1,170	)		40,731
Total assets		241,540			295,583			21,108			558,231

	Thirty-nine weeks ended September 26, 2015
	Transportation			Logistics			Other			Total
Operating revenues	$	542,884		$	299,591		$	307		$	842,782
Eliminated inter-segment revenues		(2,184	)		(4,449	)		—			(6,633	)
Income from operations		23,602			31,627			(298	)		54,931
Total assets		233,791			256,110			37,961			527,862

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 29
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599

+ Details

Commitments and Contingencies

9 Months Ended

Oct. 01, 2016

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

(12)	Commitments and Contingencies

Our principal commitments relate to long-term real estate leases and payment obligations to equipment vendors.

We are involved in certain claims and pending litigation arising from the ordinary conduct of business. We also provide accruals for claims within our self-insured retention amounts. Based on the knowledge of the facts, and in certain cases, opinions of outside counsel, in the Company’s opinion the resolution of these claims and pending litigation will not have a material effect on our financial position, results of operations or cash flows.

At October 1, 2016, approximately 28% of our employees in the United States, Canada and Colombia, and 94% of our employees in Mexico are subject to collective bargaining agreements that are renegotiated periodically, less than 1% of which are subject to contracts that expire in 2016.

Recent Accounting Pronouncements

9 Months Ended

Oct. 01, 2016

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Pronouncements

(13)	Recent Accounting Pronouncements

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, which provided new accounting guidance related to revenue recognition. The objective of ASU 2014-09 is to establish a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and will supersede most of the existing revenue recognition guidance, including industry-specific guidance. The core principle of ASU 2014-09 is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the new guidance, an entity will (1) identify the contract(s) with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the contract’s performance obligations; and (5) recognize revenue when (or as) the entity satisfies a performance obligation. ASU 2014-09 applies to all contracts with customers except those that are within the scope of other topics in the FASB Accounting Standards Codification. The new guidance was originally effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. Early adoption was originally not permitted. Entities have the option of using either a full retrospective or modified approach to adopt ASU 2014-09. In July 2015, the FASB voted to delay of the effective date of the new standard by one year. As a result of the delay, the revenue recognition standard will be effective for public companies in 2018, with early adoption permitted. We are evaluating the effect, if any, that adopting this new accounting standard will have on our consolidated financial statements and related disclosures.

In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest, which is intended to simplify the presentation of debt issuance costs. ASU 2015-03 requires that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs would not be affected by the amendments in this update. The new guidance is effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2015 for public companies. On January 1, 2016, the Company adopted this ASU on a retrospective basis. Adoption resulted in a reclassification in the Company’s current prepaid expenses and other, and noncurrent other assets in its consolidated balance sheet as of December 31, 2015 of $0.3 million and $1.2 million, respectively. The corresponding decreases were in the net presentation of the Company’s debt liability to the current portions of long-term debt and noncurrent long-term debt, respectively.

In November 2015, the FASB issued ASU 2015-17, Balance Sheet Classification of Deferred Taxes, which is intended to simplify the presentation of deferred income taxes. The ASU requires that deferred income tax liabilities and assets be classified as noncurrent in a classified balance sheet. The new guidance is effective for annual reporting periods (including interim periods within those periods) beginning after December 15, 2016 for public companies. The Company has early adopted this ASU effective January 1, 2016 on a retrospective basis. As a result of the adoption, the Company reclassified $6.3 million of current deferred tax assets to noncurrent deferred income tax liabilities, and additional $0.1 million of current deferred tax assets to noncurrent deferred assets to conform to the current year presentation.

(13)	Recent Accounting Pronouncements - continued

In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities, which amends certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Among other things, the ASU requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities. The amendments are to be applied by means of a cumulative-effect adjustment to the balance sheet and are effective for interim and annual periods beginning after December 15, 2017. With certain exceptions, early adoption is not permitted. We are evaluating the effect that adopting this new accounting standard will have on our consolidated financial statements and related disclosures.

In February 2016, the FASB issued ASU 2016-02, Leases. The objective of the new standard is to establish principles for lessees and lessors to report information about the amount, timing, and uncertainty of cash flows arising from a lease. The ASU will require a lessee to recognize the assets and liabilities that arise from leases, including operating leases. Under the new requirements, a lessee will recognize in the statement of financial position a liability to make lease payments (the lease liability) and the right-of-use asset representing the right to the underlying asset for the lease term. For leases with a term of 12 months or less, the lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. The standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early application of the amendment is permitted. We are evaluating the effect that adopting this new accounting standard will have on our consolidated financial statements and related disclosures.

In March 2016, the FASB issued ASU 2016-09, Compensation – Stock Compensation. The ASU identifies areas for simplification involving several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liability, an option to recognize gross stock compensation expense with actual forfeitures recognized as they occur, as well as certain classifications on the statement of cash flows. ASU 2016-09 is effective for annual and interim periods beginning after December 15, 2016, with early adoption permitted. The Company is currently evaluating the effect that adopting this standard will have on the Company’s financial condition, results of operations, or cash flows.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22580-107794

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22499-107794

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=56949863&loc=d3e22583-107794

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

+ Details

Subsequent Events

9 Months Ended

Oct. 01, 2016

Subsequent Events [Abstract]

Subsequent Events

(14)	Subsequent Events

On October 27, 2016, our Board of Directors declared a quarterly cash dividend of $0.07 per share of common stock, payable to shareholders of record at the close of business on November 7, 2016 and expected to be paid on November 17, 2016. Declaration of future cash dividends is subject to final determination by the Board of Directors each quarter after its review of our financial condition, results of operations, capital requirements, any legal or contractual restrictions on the payment of dividends and other factors the Board of Directors deems relevant.

Marketable Securities (Tables)

9 Months Ended

Oct. 01, 2016

Investments Debt And Equity Securities [Abstract]

Schedule of Cost, Gross Unrealized Holding Gains Losses, and Fair Value of Available-for-Sale Securities

The cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of available-for-sale securities by type were as follows (in thousands):

	Cost		Gross unrealized holding gains		Gross unrealized holding (losses)			Fair Value
At October 1, 2016
Equity Securities	$	10,322	$	4,250	$	(786	)	$	13,786

At December 31, 2015
Equity Securities	$	10,614	$	3,958	$	(1,141	)	$	13,431

Schedule of Gross Unrealized Holding Losses and Fair Value of Marketable Securities

	Less than 12 Months				12 Months or Greater				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
At October 1, 2016
Equity securities	$	908	$	163	$	2,220	$	623	$	3,128	$	786

At December 31, 2015
Equity securities	$	3,099	$	987	$	345	$	154	$	3,444	$	1,141

Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Oct. 01, 2016

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses and other current liabilities is comprised of the following (in thousands):

	October 1, 2016		December 31, 2015

Payroll related items	$	9,457	$	6,833
Driver escrow liabilities		4,129		4,486
Commissions, taxes and other		7,519		7,670
Total	$	21,105	$	18,989

Debt (Tables)

9 Months Ended

Oct. 01, 2016

Debt Disclosure [Abstract]

Details of Debt

Debt is comprised of the following (in thousands):

	Interest Rates at October 1, 2016		October 1, 2016		December 31, 2015
Outstanding Debt:
PNC $120 million revolving credit facility
LIBOR rate advance		2.03%	$	58,000	$	55,000
Domestic rate advance		4.00%		2,700		4,569
Key Equipment credit agreement		3.75%		68,436		83,578
Comerica syndicated credit facility
$40 million term loan		3.02%		35,500		40,000
$20 million revolving credit facility
LIBOR rate advance		2.52%		1,000		6,000
PRIME rate advance	NA			—		5,766
Flagstar $40 million unsecured term loan	NA			—		40,000
Real estate notes
Flagstar real estate notes		2.71%		50,937		—
Crown real estate note		3.50%		2,657		—
Equipment notes	3.24% to 3.69%			31,362		—
UBS secured borrowing facility		1.63%		—		—
				250,592		234,913
Less current portion				35,268		61,488
Total long-term debt			$	215,324	$	173,425

Fair Value Measurements and Disclosures (Tables)

9 Months Ended

Oct. 01, 2016

Fair Value Disclosures [Abstract]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	October 1, 2016
	Level 1		Level 2			Level 3		Asset/(Liability) Fair Value Measurement
Assets
Cash equivalents	$	8	$	—		$	—	$	8
Marketable securities		13,786		—			—		13,786
Liabilities
Interest rate swaps		—		(627	)		—		(627	)
Total	$	13,794	$	(627	)	$	—	$	13,167

	December 31, 2015
	Level 1		Level 2		Level 3		Asset/(Liability) Fair Value Measurement
Assets
Cash equivalents	$	96	$	—	$	—	$	96
Marketable securities		13,431		—		—		13,431
Total	$	13,527	$	—	$	—	$	13,527

Summary of Carrying Values and Estimated Fair Values of Promissory Notes

The carrying value and estimated fair value of these promissory notes at October 1, 2016 is summarized as follows:

Carrying Value

Estimated Fair

Value

Equipment and real estate promissory notes

102,455

103,695

Transactions with Affiliates (Tables)

9 Months Ended

Oct. 01, 2016

Schedule of Amounts Charged to UTSI

Following is a schedule of cost incurred for services provided by affiliates for the thirteen weeks and thirty-nine ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended				Thirty-nine Weeks Ended
	October 1, 2016		September 26, 2015		October 1, 2016		September 26, 2015

Administrative support services	$	548	$	881	$	1,906	$	2,374
Truck fuel, tolls and maintenance		619		1,012		1,864		1,622
Real estate rent and related costs		4,218		3,149		12,458		9,578
Insurance and employee benefit plans		12,496		13,374		34,802		37,358
Contracted transportation services		4		218		230		686
Total	$	17,885	$	18,634	$	51,260	$	51,618

Schedule of Services Provided to Affiliates

Following is a schedule of services provided to affiliates for the thirteen weeks and thirty-nine weeks ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended				Thirty-nine Weeks Ended
	October 1, 2016		September 26, 2015		October 1, 2016		September 26, 2015
Purchased transportation and equipment rent	$	284	$	10	$	626	$	191
Total	$	284	$	10	$	626	$	191

Comprehensive Income (Tables)

9 Months Ended

Oct. 01, 2016

Equity [Abstract]

Components of Comprehensive Income

Comprehensive income includes the following (in thousands):

	Thirteen weeks ended						Thirty-nine Weeks Ended
	October 1, 2016			September 26, 2015			October 1, 2016			September 26, 2015
Unrealized holding gains (losses) on available-for-sale investments arising during the period:
Gross amount	$	(224	)	$	(1,707	)	$	739		$	(1,740	)
Income tax (expense) benefit		77			609			(272	)		634
Net of tax amount	$	(147	)	$	(1,098	)	$	467		$	(1,106	)

Realized (gains) losses on available-for-sale investments reclassified into income:
Gross amount	$	(52	)	$	—		$	(91	)	$	(276	)
Income tax expense (benefit)		23			—			38			100
Net of tax amount	$	(29	)	$	—		$	(53	)	$	(176	)

Unrealized holding gains (losses) on interest rate swaps arising during the period:
Gross amount	$	73		$	—		$	(627	)	$	—
Income tax benefit (expense)		(28	)		—			238			—
Net of tax amount	$	45		$	—		$	(389	)	$	—

Foreign currency translation adjustments	$	(293	)	$	(987	)	$	(990	)	$	(1,753	)

Stock Based Compensation (Tables)

9 Months Ended

Oct. 01, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Status of Nonvested Shares

The following table summarizes the status of the Company’s non-vested shares and related information for the period indicated:

	Shares			Weighted Average Grant Date Fair Value
Non-vested at January 1, 2016		68,225		$	17.80
Granted		10,000		$	15.55
Vested		(15,577	)	$	19.13
Forfeited		—		$	—
Balance at October 1, 2016		62,648		$	17.11

Segment Reporting (Tables)

9 Months Ended

Oct. 01, 2016

Segment Reporting [Abstract]

Summary of Company's Reportable Segment Information

The following tables summarize information about our reportable segments as of and for the thirteen week and thirty-nine week periods ended October 1, 2016 and September 26, 2015 (in thousands):

	Thirteen weeks ended October 1, 2016
	Transportation			Logistics			Other		Total
Operating revenues	$	169,655		$	101,110		$	728	$	271,493
Eliminated inter-segment revenues		(527	)		(1,966	)		—		(2,493	)
Income from operations		4,577			5,360			90		10,027
Total assets		241,540			295,583			21,108		558,231

	Thirteen weeks ended September 26, 2015
	Transportation			Logistics			Other			Total
Operating revenues	$	186,927		$	97,179		$	108		$	284,214
Eliminated inter-segment revenues		(662	)		(1,841	)		—			(2,503	)
Income from operations		8,086			10,129			(1,271	)		16,944
Total assets		233,791			256,110			37,961			527,862

	Thirty-nine weeks ended October 1, 2016
	Transportation			Logistics			Other			Total
Operating revenues	$	496,488		$	310,896		$	1,316		$	808,700
Eliminated inter-segment revenues		(1,471	)		(5,967	)		—			(7,438	)
Income from operations		17,384			24,517			(1,170	)		40,731
Total assets		241,540			295,583			21,108			558,231

	Thirty-nine weeks ended September 26, 2015
	Transportation			Logistics			Other			Total
Operating revenues	$	542,884		$	299,591		$	307		$	842,782
Eliminated inter-segment revenues		(2,184	)		(4,449	)		—			(6,633	)
Income from operations		23,602			31,627			(298	)		54,931
Total assets		233,791			256,110			37,961			527,862

Marketable Securities - Schedule of Cost, Gross Unrealized Holding Gains Losses, and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Investments Debt And Equity Securities [Abstract]
Equity Securities, Cost	$ 10,322	$ 10,614
Equity Securities, Gross unrealized holding gains	4,250	3,958
Equity Securities, Gross unrealized holding (losses)	(786)	(1,141)
Equity Securities, Fair Value	$ 13,786	$ 13,431

Marketable Securities - Additional Information (Detail) $ in Millions	9 Months Ended
	Oct. 01, 2016 USD ($) Company
Marketable Securities [Abstract]
Fair value of equity securities	$ 3.1
Temporary impairment loss of equity securities	$ 0.8
Number of investments in publicly traded companies \| Company	29

Marketable Securities - Schedule of Gross Unrealized Holding Losses and Fair Value of Marketable Securities (Detail) - Equity securities [Member] - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Equity securities, Less than 12 Months Fair Value	$ 908	$ 3,099
Equity securities, Less than 12 Months Unrealized Losses	163	987
Equity securities, 12 Months or Greater Fair Value	2,220	345
Equity securities, 12 Months or Greater Unrealized Losses	623	154
Equity securities, Total, Fair Value	3,128	3,444
Equity securities, Total, Unrealized Losses	$ 786	$ 1,141

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Payroll related items	$ 9,457	$ 6,833
Driver escrow liabilities	4,129	4,486
Commissions, taxes and other	7,519	7,670
Total	$ 21,105	$ 18,989

Debt - Details of Debt (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Outstanding Debt:
Outstanding Debt	$ 250,592	$ 234,913
Less current portion	35,268	61,488
Total long-term debt	$ 215,324	173,425
Key Equipment credit agreement [Member]
Outstanding Debt:
Credit facility, Interest Rates	3.75%
Outstanding Debt	$ 68,436	83,578
Equipment notes [Member]
Outstanding Debt:
Outstanding Debt	$ 31,362
Equipment notes [Member] \| Minimum [Member]
Outstanding Debt:
Credit facility, Interest Rates	3.24%
Equipment notes [Member] \| Maximum [Member]
Outstanding Debt:
Credit facility, Interest Rates	3.69%
UBS secured borrowing facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	1.63%
LIBOR rate advance [Member] \| Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	2.03%
Outstanding Debt	$ 58,000	55,000
LIBOR rate advance [Member] \| Revolving Credit Facility [Member] \| Comerica syndicated credit facility, $20 million revolving credit facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	2.52%
Outstanding Debt	$ 1,000	6,000
Domestic rate advance [Member] \| Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	4.00%
Outstanding Debt	$ 2,700	4,569
Term Loan [Member] \| Comerica syndicated credit facility, $40 million term loan [Member]
Outstanding Debt:
Credit facility, Interest Rates	3.02%
Outstanding Debt	$ 35,500	40,000
PRIME rate advance [Member] \| Revolving Credit Facility [Member] \| Comerica syndicated credit facility, $20 million revolving credit facility [Member]
Outstanding Debt:
Outstanding Debt		5,766
Unsecured Term Loan [Member] \| Flagstar $40 million unsecured term loan [Member]
Outstanding Debt:
Outstanding Debt	$ 0	$ 40,000
Unsecured Term Loan [Member] \| Flagstar real estate notes [Member]
Outstanding Debt:
Credit facility, Interest Rates	2.71%
Outstanding Debt	$ 50,937
Unsecured Term Loan [Member] \| Crown real estate note [Member]
Outstanding Debt:
Credit facility, Interest Rates	3.50%
Outstanding Debt	$ 2,657
Secured Debt [Member] \| UBS secured borrowing facility [Member]
Outstanding Debt:
Credit facility, Interest Rates	1.63%

Debt - Details of Debt (Parenthetical) (Detail) $ in Millions	Oct. 01, 2016 USD ($)
PNC $120 million revolving credit facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 120
Comerica syndicated credit facility, $40 million term loan [Member] \| Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	40
Comerica syndicated credit facility, $20 million revolving credit facility [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	20
Flagstar $40 million unsecured term loan [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	$ 40

Debt - December 2015 Debt Refinancing - Additional Information (Detail) - USD ($) $ in Millions	Oct. 01, 2016	Dec. 31, 2015	Dec. 23, 2015
Line of Credit Facility [Line Items]
Net of debt issuance cost	$ 1.7	$ 1.5
Syndicated Comerica Bank Revolving Credit
Line of Credit Facility [Line Items]
Borrowed under the credit facility			$ 234.9

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Debt - Revolving Credit Facility - Additional Information (Detail) - USD ($)	9 Months Ended
	Oct. 01, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Letters of credit	$ 0	$ 0
Credit facility, Interest Rates	LIBOR rate plus 2.25%
PNC $120 million revolving credit facility [Member]
Line of Credit Facility [Line Items]
Credit facility fees percentage	0.25%
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 120,000,000
Increase in revolving credit facility	$ 30,000,000
Credit facility, expiration date	Dec. 23, 2020
Debt instrument, face amount	$ 120,000,000
Debt instrument, carrying amount	60,700,000
Credit facility available for borrowings pursuant to the agreement	28,000,000
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member] \| Net eligible accounts receivable [Member]
Line of Credit Facility [Line Items]
Credit facility, secured by asset	98,500,000
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member] \| $58.0 million LIBOR rate advance [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 58,000,000
Credit facility, Interest Rates	LIBOR plus 1.50%
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member] \| $58.0 million LIBOR rate advance [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	2.03%
Interest rate above variable base rate	1.50%
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member] \| $2.7 million domestic rate advance [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 2,700,000
Credit facility, Interest Rates	Prime rate plus 0.50%
Revolving Credit Facility [Member] \| PNC $120 million revolving credit facility [Member] \| $2.7 million domestic rate advance [Member] \| Prime [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	4.00%
Interest rate above variable base rate	0.50%
Swing Loan sub-facility [Member]
Line of Credit Facility [Line Items]
Borrowed under the credit facility	$ 0	0
Swing Loan sub-facility [Member] \| PNC $120 million revolving credit facility [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity		10,200,000
Swing Loan sub-facility [Member] \| PNC $120 million revolving credit facility [Member] \| Letter Of Credit
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity		$ 3,000,000

Debt - Key Equipment Credit Agreement - Additional Information (Detail) - Key Equipment credit agreement [Member] $ in Millions	9 Months Ended
	Oct. 01, 2016 USD ($) Installment
Line of Credit Facility [Line Items]
Borrowed under the credit facility	$ 83.6
Fixed interest rate	3.75%
Fixed charge coverage ratio	110.00%
Promissory Notes [Member]
Line of Credit Facility [Line Items]
Borrowed under the credit facility	$ 68.4
Number of installments \| Installment	60
Frequency of installments	Monthly

- Definition

+ References + Details

Debt - Comerica Syndicated Credit Facility - Additional Information (Detail)	9 Months Ended
	Oct. 01, 2016 USD ($) Installment	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Outstanding Debt	$ 250,592,000	$ 234,913,000
Credit facility, Interest Rates	LIBOR rate plus 2.25%
Letters of credit	$ 0	0
Comerica Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 60,000,000
Credit facility, expiration date	Dec. 23, 2020
Line of credit facility, interest rate description	The applicable margin fluctuates based on Westport’s total debt to EBITDA ratio, as defined in the Credit Agreement.
Borrowed under the credit facility	$ 11,500,000
Letters of credit	0	0
Debt instrument, carrying amount	$ 1,000,000
Repayments of borrowings under term loan and revolving credit facility	50% (which percentage shall be reduced to zero subject to Westport attaining a certain leverage ratio) of Westport’s annual excess cash flow, as defined; 100% of the net cash proceeds if we sell Westport’s machining division; 50% of net proceeds from certain equity issuances; 100% of proceeds from the issuance of certain indebtedness; and 100% of net proceeds from the sale of certain assets, insurance and condemnation proceeds
Equity interest in Westport	100.00%
Debt instrument, covenant term	The Credit Agreement includes financial covenants requiring Westport to maintain a minimum fixed charge coverage ratio, minimum quarterly EBITDA amounts, as defined in the Credit Agreement, and a maximum debt to EBITDA ratio, as well as customary affirmative and negative covenants and events of default. At October 1, 2016, Westport was in compliance with the debt covenants.
Comerica Syndicated Credit Facility [Member] \| Net eligible accounts receivable [Member]
Line of Credit Facility [Line Items]
Credit facility, secured by asset	$ 10,500,000
Comerica Syndicated Credit Facility [Member] \| Inventory [Member]
Line of Credit Facility [Line Items]
Credit facility, secured by asset	$ 6,500,000
Comerica Syndicated Credit Facility [Member] \| Minimum [Member]
Line of Credit Facility [Line Items]
Facility fee	0.25%
Comerica Syndicated Credit Facility [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Facility fee	0.50%
Comerica Syndicated Credit Facility [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 20,000,000
Line of credit facility, first quarterly interest payment commencement date	Mar. 01, 2016
Line of credit facility, frequency of payment term	Interest on the unpaid balance of all revolving credit facility and swing line base rate advances is payable quarterly in arrears commencing on March 1, 2016, and on the first day of each June, September, December and March thereafter. Interest on the unpaid balance of each Eurodollar-based advance of the revolving credit facility is payable on the last day of the applicable Eurodollar interest period. Interest on the unpaid balance of each quoted rate based advance of the swing line is payable on the last day of the applicable quoted rate interest period
Comerica Syndicated Credit Facility [Member] \| Swing Line sub-facility [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 4,000,000
Borrowed under the credit facility	0	$ 0
Comerica Syndicated Credit Facility [Member] \| Letter Of Credit
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	2,000,000
Comerica Syndicated Credit Facility [Member] \| Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 40,000,000
Credit facility, expiration date	Dec. 23, 2020
Number of installments \| Installment	20
Frequency of installments	Quarterly
Term loan installment amount	$ 1,500,000
Debt Instrument, term	5 years
Outstanding Debt	$ 35,500,000
Credit facility, Interest Rates	30-day LIBOR plus 2.50%
Debt instrument, first quarterly interest payment commencement date	Jan. 01, 2016
Debt instrument, frequency of payment term	Interest on the unpaid principal of all term loan base rate advances is payable quarterly in arrears commencing on January 1, 2016, and on the first day of each April, July, October and January thereafter. Interest on the unpaid principal of each Eurodollar-based advance of the term loan is payable on the last day of the applicable Eurodollar interest period
Comerica Syndicated Credit Facility [Member] \| Term Loan [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	3.02%
Interest rate above variable base rate	2.50%
Comerica Syndicated Credit Facility [Member] \| $6.0 million LIBOR rate advance [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	$ 1,000,000
Credit facility, Interest Rates	30-day LIBOR plus 2.00%
Comerica Syndicated Credit Facility [Member] \| $6.0 million LIBOR rate advance [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	2.52%
Interest rate above variable base rate	2.00%

Debt - Flagstar Unsecured Term Loan - Additional Information (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jun. 21, 2016	Oct. 01, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Outstanding Debt		$ 250,592	$ 234,913
Flagstar $40 million unsecured term loan [Member] \| Unsecured Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 40,000
Credit facility, expiration date		Jul. 15, 2016
Borrowed under credit agreement	$ 32,800
Outstanding Debt		$ 0	$ 40,000
Flagstar $40 million unsecured term loan [Member] \| Unsecured Term Loan [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate above variable base rate		3.50%

Debt - Real Estate Notes - Additional Information (Detail) $ in Thousands			9 Months Ended
	Sep. 06, 2016 USD ($)	Jun. 21, 2016 USD ($)	Oct. 01, 2016 USD ($) Installment	Aug. 08, 2016 USD ($)	Dec. 31, 2015 USD ($)
Line of Credit Facility [Line Items]
Credit facility, Interest Rates			LIBOR rate plus 2.25%
Outstanding Debt			$ 250,592		$ 234,913
Unsecured Term Loan [Member] \| Flagstar real estate notes [Member]
Line of Credit Facility [Line Items]
Borrowed under credit agreement		$ 32,800
Debt instrument, face amount		$ 40,000
Credit facility, Interest Rates			LIBOR plus 2.25%
Frequency of installments			Monthly
Debt instrument, first quarterly interest payment commencement date			Jul. 01, 2016
Principal amount due date			Jun. 30, 2026
Outstanding Debt			$ 50,937
Debt service coverage ratio			102.00%
Interest accrued percentage			2.71%
Unsecured Term Loan [Member] \| Crown real estate note [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount				$ 22,500
Frequency of installments			Monthly
Debt instrument, first quarterly interest payment commencement date			Sep. 15, 2016
Principal amount due date			Aug. 15, 2026
Number of installments \| Installment			120
Fixed interest rate			3.50%
Outstanding Debt			$ 2,657
Secured Debt [Member] \| Flagstar real estate notes [Member]
Line of Credit Facility [Line Items]
Borrowed under credit agreement	$ 19,000
Credit facility, Interest Rates			LIBOR plus 2.25%
Debt instrument, first quarterly interest payment commencement date			Oct. 01, 2016
Principal amount due date			Sep. 05, 2026
Secured Debt [Member] \| Flagstar real estate notes [Member] \| LIBOR [Member]
Line of Credit Facility [Line Items]
Interest rate above variable base rate			2.25%

Debt - Equipment Notes - Additional Information (Detail) $ in Thousands	9 Months Ended
	Oct. 01, 2016 USD ($) Installment	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Outstanding Debt	$ 250,592	$ 234,913
Equipment notes [Member]
Debt Instrument [Line Items]
Purchasing revenue equipment	$ 33,600
Number of installments \| Installment	60
Frequency of installments	Monthly
Outstanding Debt	$ 31,362
Equipment notes [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.24%
Equipment notes [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.69%

Debt - UBS Secured Borrowing Facility - Additional Information (Detail) - UBS secured borrowing facility [Member] - USD ($)	9 Months Ended
	Oct. 01, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Interest rate above variable base rate	1.10%
Interest accrued percentage	1.63%
Borrowed under the credit facility	$ 0	$ 0
Credit facility, borrowing capacity	$ 7,300,000	$ 7,400,000

- Definition

+ References + Details

Debt - Swap Agreements - Additional Information (Detail) $ in Millions	9 Months Ended
	Oct. 01, 2016 USD ($) Agreement
Line of Credit Facility [Line Items]
Number of swap agreements \| Agreement	2
Combined notional amount	$ 15.7
Description of variable rate basis	LIBOR rate plus 2.25%
Fair value liability of swap agreement	$ 0.6
Swap A [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	4.16%
Amortizing notional amount	$ 10.0
Effective date	Oct. 31, 2016
Swap B [Member]
Line of Credit Facility [Line Items]
Interest accrued percentage	3.83%
Amortizing notional amount	$ 5.7
Effective date	Oct. 31, 2016
Swap C [Member]
Line of Credit Facility [Line Items]
Number of swap agreements \| Agreement	3
Description of variable rate basis	LIBOR rate
Swap interest rate	0.78%

Fair Value Measurements and Disclosures - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 13,786	$ 13,431
Asset (Liability) Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	8	96
Marketable securities	13,786	13,431
Interest rate swaps	(627)
Total	13,167	13,527
Asset (Liability) Fair Value, Measurements, Recurring [Member] \| Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		96
Marketable securities		13,431
Total		$ 13,527
Asset (Liability) Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps	(627)
Total	$ (627)

Fair Value Measurements and Disclosures - Summary of Carrying Values and Estimated Fair Values of Promissory Notes (Detail) - Equipment and Real Estate Promissory Notes [Member]	Oct. 01, 2016 USD ($)
Carrying Reported Amount Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	$ 102,455
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument	$ 103,695

Transactions with Affiliates - Schedule of Amounts Charged to UTSI (Detail) - Affiliates [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	$ 17,885	$ 18,634	$ 51,260	$ 51,618
Administrative support services [Member]
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	548	881	1,906	2,374
Truck fuel, tolls and maintenance [Member]
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	619	1,012	1,864	1,622
Real estate rent and related costs [Member]
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	4,218	3,149	12,458	9,578
Insurance and employee benefit plans [Member]
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	12,496	13,374	34,802	37,358
Contracted transportation services [Member]
Related Party Transaction [Line Items]
Cost incurred for services provided by CenTra and affiliates	$ 4	$ 218	$ 230	$ 686

Transactions with Affiliates - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Oct. 01, 2016 USD ($)	Sep. 26, 2015 USD ($)	Oct. 01, 2016 USD ($) Facility	Sep. 26, 2015 USD ($)	Aug. 08, 2016 USD ($)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Occupancy of facilities either on monthly or contractual basis \| Facility			31
Insurance, claims and other receivables	$ 7,700,000		$ 7,700,000			$ 11,500,000
Due to affiliates	6,558,000		6,558,000			3,413,000
Amounts paid for legal services	0	$ 0	0	$ 1,400
Due from affiliates	2,818,000		2,818,000			$ 1,924,000
Affiliates [Member]
Related Party Transaction [Line Items]
Cost of real property improvements			1,000,000
Affiliates [Member] \| Wheels and Tires [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate			1,400,000
Affiliates [Member] \| Revenue Equipment [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate			200,000
Affiliates [Member] \| Snow Removal Equipment [Member]
Related Party Transaction [Line Items]
Cost of purchase from an affiliate				$ 18,000
Crown Enterprises, Inc [Member] \| Unsecured Term Loan [Member] \| Multi-building Cross-dock Logistics Terminal [Member]
Related Party Transaction [Line Items]
Debt instrument, face amount					$ 22,500,000
Debt instrument, carrying amount	$ 2,700,000		$ 2,700,000
Principal amount due date			Aug. 15, 2026

Transactions with Affiliates - Schedule of Services Provided to Affiliates (Detail) - Affiliates [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Related Party Transaction [Line Items]
Services provided to affiliates	$ 284	$ 10	$ 626	$ 191
Purchased Transportation And Equipment Rent [Member]
Related Party Transaction [Line Items]
Services provided to affiliates	$ 284	$ 10	$ 626	$ 191

Comprehensive Income - Components of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Statement Of Income And Comprehensive Income [Abstract]
Unrealized holding gains (losses) on available-for-sale investments, Gross amount	$ (224)	$ (1,707)	$ 739	$ (1,740)
Unrealized holding gains (losses) on available-for-sale investments, Income tax (expense) benefit	77	609	(272)	634
Unrealized holding gains (losses) on available-for-sale investments, Net of tax amount	(147)	(1,098)	467	(1,106)
Realized (gains) losses on available-for-sale investments, Gross amount	(52)		(91)	(276)
Realized (gains) losses on available-for-sale investments, Income tax expense (benefit)	23		38	100
Realized (gains) losses on available-for-sale investments, Net of tax amount	(29)		(53)	(176)
Unrealized holding losses on interest rate swaps, Gross amount	73		(627)
Unrealized holding gains losses on interest rate swaps, Income tax benefit	(28)		238
Unrealized holding gains losses on interest rate swaps, Net of tax amount	45		(389)
Foreign currency translation adjustments	$ (293)	$ (987)	$ (990)	$ (1,753)

Stock Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions						9 Months Ended
	Feb. 24, 2016	Dec. 23, 2015	Apr. 29, 2015	Mar. 05, 2015	Dec. 20, 2012	Oct. 01, 2016	Sep. 26, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock grants vested		25.00%			20.00%
Total fair value of shares vested						$ 0.3	$ 0.2
Total unrecognized compensation cost						1.1
Share based compensation cost is expected to be recognized on a straight-line basis during remainder of 2016						0.2
Share based compensation cost is expected to be recognized on a straight-line basis in fiscal 2017						0.4
Share based compensation cost is expected to be recognized on a straight-line basis in fiscal 2018						0.4
Share based compensation cost is expected to be recognized on a straight-line basis in fiscal 2019						$ 0.1
Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock grants vested	25.00%		25.00%	25.00%
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of restricted stock granted		50,000			178,137	10,000
Restricted stock grant date fair value per share		$ 14.93				$ 15.55
Restricted Stock [Member] \| Chief Executive Officer [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of restricted stock granted	10,000		20,000	10,000
Equal Increments on Each December 20 in 2016, 2017 and 2018 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional restricted stock grants vested per year						25.00%
Grants Vesting on March 5, 2018 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional restricted stock grants vested per year						25.00%
Equal Increments on Each March 5 in 2016, 2017 and 2018 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional restricted stock grants vested per year						25.00%
Equal Increments on Each March 5 in 2017, 2018 and 2019 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional restricted stock grants vested per year						25.00%
Grants Vesting on December 20, 2016 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional restricted stock grants vested per year						20.00%

Stock Based Compensation - Summary of Status of Nonvested Shares (Detail) - Restricted Stock [Member] - $ / shares			9 Months Ended
	Dec. 23, 2015	Dec. 20, 2012	Oct. 01, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares Nonvested, Beginning Balance			68,225
Shares, Granted	50,000	178,137	10,000
Shares, Vested			(15,577)
Shares, Ending Balance			62,648
Weighted Average Grant Date Fair Value, Beginning Balance			$ 17.80
Weighted Average Grant Date Fair Value, Granted	$ 14.93		15.55
Weighted Average Grant Date Fair Value, Vested			19.13
Weighted Average Grant Date Fair Value, Ending Balance			$ 17.11

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Earnings Per Share [Abstract]
Weighted average non-vested shares of restricted shares	0	177	0	3,502
Antidilutive securities excluded from computation of earnings per share, amount	68,225	0	68,225	0

Dividends - Additional Information (Detail) - $ / shares		3 Months Ended		9 Months Ended
	Apr. 29, 2016	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Earnings Per Share [Abstract]
Quarterly cash dividend declared per common stock	$ 0.07	$ 0.07	$ 0.07	$ 0.21	$ 0.21
Dividends payable, date declared				Jul. 28, 2016
Dividends payable, recorded date				Aug. 08, 2016
Dividends payable, date to be paid				Aug. 18, 2016

Segment Reporting - Summary of Company's Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 271,493	$ 284,214	$ 808,700	$ 842,782
Income from operations	10,027	16,944	40,731	54,931
Total assets	558,231	527,862	558,231	527,862	$ 503,155
Operating Segments [Member] \| Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	169,655	186,927	496,488	542,884
Income from operations	4,577	8,086	17,384	23,602
Total assets	241,540	233,791	241,540	233,791
Operating Segments [Member] \| Logistics [Member]
Segment Reporting Information [Line Items]
Revenues	101,110	97,179	310,896	299,591
Income from operations	5,360	10,129	24,517	31,627
Total assets	295,583	256,110	295,583	256,110
Other [Member]
Segment Reporting Information [Line Items]
Revenues	728	108	1,316	307
Income from operations	90	(1,271)	(1,170)	(298)
Total assets	21,108	37,961	21,108	37,961
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(2,493)	(2,503)	(7,438)	(6,633)
Intersegment Eliminations [Member] \| Transportation [Member]
Segment Reporting Information [Line Items]
Revenues	(527)	(662)	(1,471)	(2,184)
Intersegment Eliminations [Member] \| Logistics [Member]
Segment Reporting Information [Line Items]
Revenues	$ (1,966)	$ (1,841)	$ (5,967)	$ (4,449)

Commitments and Contingencies - Additional Information (Detail) - Workforce Subject to Collective Bargaining Arrangements [Member] - Unionized Employees Concentration Risk [Member]	9 Months Ended
	Oct. 01, 2016
United States, Canada and Colombia [Member]
Concentration Risk [Line Items]
Percentage of revenues from major customers	28.00%
Mexico [Member]
Concentration Risk [Line Items]
Percentage of revenues from major customers	94.00%
Maximum [Member]
Concentration Risk [Line Items]
Percentage of employees agreements that expire in 2016	1.00%

Recent Accounting Pronouncements- Additional Information (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Dec. 31, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Current prepaid expense and other	$ 19,814	$ 17,858
Other noncurrent assets	4,522	3,894
Noncurrent deferred income tax liabilities	40,155	40,496
Noncurrent deferred assets	63	83
Reclassification Adjustment [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Current prepaid expense and other		300
Other noncurrent assets		$ 1,200
Noncurrent deferred income tax liabilities	6,300
Noncurrent deferred assets	$ 100

Subsequent Events - Additional Information (Detail) - $ / shares			3 Months Ended		9 Months Ended
	Oct. 27, 2016	Apr. 29, 2016	Oct. 01, 2016	Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
Subsequent Event [Line Items]
Dividends payable, date declared					Jul. 28, 2016
Quarterly cash dividend declared per common stock		$ 0.07	$ 0.07	$ 0.07	$ 0.21	$ 0.21
Dividends payable, recorded date					Aug. 08, 2016
Dividends payable, date to be paid					Aug. 18, 2016
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends payable, date declared	Oct. 27, 2016
Quarterly cash dividend declared per common stock	$ 0.07
Dividends payable, recorded date	Nov. 07, 2016
Dividends payable, date to be paid	Nov. 17, 2016

Segment Reporting - Additional Information (Detail)	9 Months Ended
Segment Reporting - Additional Information (Detail)	Oct. 01, 2016 Segment
Segment Reporting [Abstract]
Number of reportable segments	2