Landstar System (LSTR) 10-Q 31 Jul 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 27, 2015	Jul. 20, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 27, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Trading Symbol	LSTR
Entity Registrant Name	LANDSTAR SYSTEM INC
Entity Central Index Key	853,816
Current Fiscal Year End Date	--12-26
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		43,575,617

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Current Assets
Cash and cash equivalents	$ 82,426	$ 163,944
Short-term investments	48,864	37,007
Trade accounts receivable, less allowance of $4,441 and $4,338	481,605	492,642
Other receivables, including advances to independent contractors, less allowance of $4,304 and $4,189	21,678	15,132
Deferred income taxes and other current assets	22,307	23,603
Total current assets	656,880	732,328
Operating property, less accumulated depreciation and amortization of $169,110 and $160,681	190,082	202,203
Goodwill	31,134	31,134
Other assets	68,848	78,547
Total assets	946,944	1,044,212
Current Liabilities
Cash overdraft	31,717	34,629
Accounts payable	216,807	220,077
Current maturities of long-term debt	34,189	35,064
Insurance claims	22,123	24,233
Dividends payable		44,794
Other current liabilities	41,617	51,654
Total current liabilities	346,453	410,451
Long-term debt, excluding current maturities	59,020	76,257
Insurance claims	23,491	21,769
Deferred income taxes and other noncurrent liabilities	48,478	47,474
Shareholders' Equity
Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,357,102 and 67,268,817 shares	674	673
Additional paid-in capital	191,221	189,012
Retained earnings	1,319,674	1,255,374
Cost of 23,781,485 and 22,474,331 shares of common stock in treasury	(1,040,248)	(955,613)
Accumulated other comprehensive loss	(1,819)	(1,185)
Total shareholders' equity	469,502	488,261
Total liabilities and shareholders' equity	$ 946,944	$ 1,044,212

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Allowance on trade accounts receivable	$ 4,441	$ 4,338
Allowance on other receivables	4,304	4,189
Accumulated depreciation and amortization on operating property	$ 169,110	$ 160,681
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,357,102	67,268,817
Treasury stock, shares	23,781,485	22,474,331

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Revenue	$ 868,383	$ 814,443	$ 1,630,763	$ 1,502,640
Investment income	339	332	693	695
Costs and expenses:
Purchased transportation	667,577	628,933	1,254,730	1,158,964
Commissions to agents	70,032	63,861	129,816	116,565
Other operating costs, net of gains on asset sales/dispositions	7,981	6,243	15,670	12,829
Insurance and claims	12,312	13,849	27,108	25,706
Selling, general and administrative	37,738	36,752	74,986	72,352
Depreciation and amortization	7,049	6,565	14,068	13,333
Total costs and expenses	802,689	756,203	1,516,378	1,399,749
Operating income	66,033	58,572	115,078	103,586
Interest and debt expense	713	718	1,494	1,486
Income before income taxes	65,320	57,854	113,584	102,100
Income taxes	24,849	21,929	43,098	38,537
Net income	$ 40,471	$ 35,925	$ 70,486	$ 63,563
Earnings per common share	$ 0.92	$ 0.80	$ 1.59	$ 1.41
Diluted earnings per share	$ 0.92	$ 0.80	$ 1.59	$ 1.40
Average number of shares outstanding:
Earnings per common share	43,892,000	44,935,000	44,240,000	45,171,000
Diluted earnings per share	44,033,000	45,128,000	44,397,000	45,362,000
Dividends per common share	$ 0.07	$ 0.06	$ 0.14	$ 0.12

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Net income	$ 40,471	$ 35,925	$ 70,486	$ 63,563
Other comprehensive income (loss):
Unrealized holding gains (losses) on available-for-sale investments, net of tax expense (benefit) of $35, $125, ($90) and $65	(164)	119	64	229
Foreign currency translation (losses) gains	(418)	175	(698)	(257)
Other comprehensive (loss) income	(582)	294	(634)	(28)
Comprehensive income	$ 39,889	$ 36,219	$ 69,852	$ 63,535

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Unrealized holding gains on available-for-sale investments, tax expense	$ (90)	$ 65	$ 35	$ 125

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
OPERATING ACTIVITIES
Net income	$ 70,486	$ 63,563
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property	14,068	13,333
Non-cash interest charges	109	109
Provisions for losses on trade and other accounts receivable	3,344	2,650
Gains on sales/disposals of operating property	(178)	(736)
Deferred income taxes, net	1,859	1,304
Stock-based compensation	3,243	2,799
Changes in operating assets and liabilities:
Decrease (increase) in trade and other accounts receivable	1,147	(64,709)
Decrease (increase) in other assets	1,596	(15,592)
(Decrease) increase in accounts payable	(3,270)	37,539
Decrease in other liabilities	(9,999)	(11,939)
Decrease in insurance claims	(388)	(14,721)
NET CASH PROVIDED BY OPERATING ACTIVITIES	82,017	13,600
INVESTING ACTIVITIES
Net change in other short-term investments		(3,225)
Sales and maturities of investments	16,656	20,830
Purchases of investments	(20,052)	(21,807)
Purchases of operating property	(3,050)	(1,354)
Proceeds from sales of operating property	1,281	2,410
NET CASH USED BY INVESTING ACTIVITIES	(5,165)	(3,146)
FINANCING ACTIVITIES
Decrease in cash overdraft	(2,912)	(578)
Dividends paid	(50,980)	(21,341)
Proceeds from exercises of stock options	534	2,111
Taxes paid in lieu of shares issued related to stock-based compensation plans	(2,083)	(1,724)
Excess tax benefits from stock-based awards	516	669
Purchases of common stock	(84,635)	(56,393)
Principal payments on long-term debt and capital lease obligations	(18,112)	(20,110)
NET CASH USED BY FINANCING ACTIVITIES	(157,672)	(97,366)
Effect of exchange rate changes on cash and cash equivalents	(698)	(257)
Decrease in cash and cash equivalents	(81,518)	(87,169)
Cash and cash equivalents at beginning of period	163,944	180,302
Cash and cash equivalents at end of period	$ 82,426	$ 93,133

Consolidated Statement of Chang

Consolidated Statement of Changes in Shareholders Equity - 6 months ended Jun. 27, 2015 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 27, 2014		67,268,817			22,474,331
Beginning Balance at Dec. 27, 2014	$ 488,261	$ 673	$ 189,012	$ 1,255,374	$ (955,613)	$ (1,185)
Net income	70,486			70,486
Dividends	(6,186)			(6,186)
Purchases of common stock (in shares)					1,307,154
Purchases of common stock	(84,635)				$ (84,635)
Issuance of stock related to stock-based compensation plans, including excess tax effect (in shares)		88,285
Issuance of stock related to stock-based compensation plans, including excess tax effect	(1,033)	$ 1	(1,034)
Stock-based compensation	3,243		3,243
Other comprehensive loss	(634)					(634)
Ending Balance (in shares) at Jun. 27, 2015		67,357,102			23,781,485
Ending Balance at Jun. 27, 2015	$ 469,502	$ 674	$ 191,221	$ 1,319,674	$ (1,040,248)	$ (1,819)

Consolidated Statement of Chan9

Consolidated Statement of Changes in Shareholders Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Dividends per common share	$ 0.07	$ 0.06	$ 0.14	$ 0.12

Share-based Payment Arrangement

Share-based Payment Arrangements	6 Months Ended
	Jun. 27, 2015
Share-based Payment Arrangements	(1) Share-based Payment Arrangements As of June 27, 2015, the Company had two employee equity incentive plans, the 2002 employee stock option and stock incentive plan (the “ESOSIP”) and the 2011 equity incentive plan (the “2011 EIP”). No further grants can be made under the ESOSIP. The Company also has a stock compensation plan for members of its Board of Directors, the 2013 Directors Stock Compensation Plan (the “2013 DSCP”). 115,000 shares of the Company’s common stock were authorized for issuance under the 2013 DSCP. The ESOSIP, 2011 EIP, and 2013 DSCP are each referred to herein as a “Plan,” and, collectively, as the “Plans.” Amounts recognized in the financial statements with respect to these Plans are as follows (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Total cost of the Plans during the period $ 3,243 $ 2,799 $ 1,576 $ 1,635 Amount of related income tax benefit recognized during the period (1,270 ) (1,277 ) (569 ) (663 ) Net cost of the Plans during the period $ 1,973 $ 1,522 $ 1,007 $ 972 Included in income tax benefits recognized in the twenty-six-week periods ended June 27, 2015 and June 28, 2014 were income tax benefits of $213,000 and $464,000, respectively, recognized on disqualifying dispositions of the Company’s common stock by employees who obtained shares of common stock through exercises of incentive stock options. As of June 27, 2015, there were 94,334 shares of the Company’s common stock reserved for issuance under the 2013 DSCP and 5,555,519 shares of the Company’s common stock reserved for issuance in the aggregate under the ESOSIP and 2011 EIP. Restricted Stock Units The following table summarizes information regarding the Company’s outstanding restricted stock unit (“RSU”) awards under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 27, 2014 425,630 $ 50.72 Granted 111,669 $ 53.31 Vested (91,382 ) $ 51.98 Outstanding at June 27, 2015 445,917 $ 51.11 During the twenty-six-week period ended June 27, 2015, the Company issued RSUs with a performance condition and RSUs with a market condition, as further described below. RSUs with a performance condition vest over a 3 to 5 year period generally based on varying metrics of growth in operating income and diluted earnings per share either from a base year, being the year immediately preceding the year of grant, or year-over-prior-year growth. At the time of grant, the maximum number of common shares available for issuance under the January 27, 2015 grant equals 200% of the number of RSUs granted. The maximum number of common shares available for issuance under grants made prior to 2015 equals 100% of the number of RSUs granted. The fair value of an RSU with a performance condition was determined based on the market value of the Company’s common stock on the date of grant, discounted for lack of marketability for a minimum post-vesting holding requirement. The discount rate due to lack of marketability used for RSU award grants with a performance condition during both twenty-six-week periods ended June 27, 2015 and June 28, 2014 was 7%. With respect to RSU awards with a performance condition, the Company reports compensation expense over the life of the award based on an estimated number of units that will vest over the life of the award, multiplied by the fair value of a RSU. On May 1, 2015, the Company granted 20,000 RSUs that vest based on a market condition. These RSUs may vest on April 30 of 2019, 2020 and 2021 based on the Company’s total shareholder return (“TSR”) compound annual growth rate over the vesting periods, adjusted to reflect dividends (if any) paid during such periods and capital adjustments as may be necessary. The maximum number of common shares available for issuance under the May 1, 2015 grant equals 150% of the number of RSUs granted. The fair value of this RSU award was determined at the time of grant based on the expected achievement of the market condition at the end of each vesting period. With respect to these RSU awards, the Company reports compensation expense ratably over the life of the award based on an estimated number of units that will vest over the life of the award, multiplied by the fair value of the RSU. Previously recognized compensation cost would be reversed only if the employee terminated employment prior to completing the requisite service period. The Company recognized approximately $2,246,000 and $1,588,000 of share-based compensation expense related to RSU awards in the twenty-six-week periods ended June 27, 2015 and June 28, 2014, respectively. As of June 27, 2015, there was a maximum of $26,174,000 of total unrecognized compensation cost related to RSU awards granted under the Plans with an expected average remaining life of approximately 3.2 years. With respect to RSU awards, the amount of future compensation expense to be recognized will be determined based on future operating results. Stock Options The following table summarizes information regarding the Company’s outstanding stock options under the Plans: Number of Weighted Average per Share Weighted Average Term (years) Aggregate Intrinsic Options outstanding at December 27, 2014 773,839 $ 46.92 Exercised (65,600 ) $ 45.59 Forfeited (1,000 ) $ 52.60 Options outstanding at June 27, 2015 707,239 $ 47.04 5.3 $ 14,225 Options exercisable at June 27, 2015 478,339 $ 45.06 4.7 $ 10,565 The total intrinsic value of stock options exercised during the twenty-six-week periods ended June 27, 2015 and June 28, 2014 was $1,417,000 and $6,386,000, respectively. As of June 27, 2015, there was $2,145,000 of total unrecognized compensation cost related to non-vested stock options granted under the Plans. The unrecognized compensation cost related to these non-vested options is expected to be recognized over a weighted average period of 1.8 years. Non-vested Restricted Stock The following table summarizes information regarding the Company’s outstanding non-vested restricted stock under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 27, 2014 23,353 $ 54.90 Granted 1,197 $ 62.46 Vested (6,490 ) $ 57.79 Outstanding at June 27, 2015 18,060 $ 54.36 The fair value of each share of non-vested restricted stock issued under the Plans is based on the fair value of a share of the Company’s common stock on the date of grant and shares of non-vested restricted stock are generally subject to vesting in three equal annual installments or 100% on the fifth anniversary of the date of the grant. As of June 27, 2015, there was $661,000 of total unrecognized compensation cost related to non-vested shares of restricted stock granted under the Plans. The unrecognized compensation cost related to these non-vested shares of restricted stock is expected to be recognized over a weighted average period of 1.4 years.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 27, 2015
Income Taxes	(2) Income Taxes The provisions for income taxes for both the 2015 and 2014 twenty-six-week periods were based on estimated annual effective income tax rates of 38.2%, adjusted for discrete events, such as benefits resulting from disqualifying dispositions of the Company’s common stock by employees who obtained the stock through exercises of incentive stock options. The effective income tax rates for the 2015 and 2014 twenty-six-week periods were 37.9% and 37.7%, respectively, which were higher than the statutory federal income tax rate primarily as a result of state taxes, the meals and entertainment exclusion and non-deductible stock-based compensation.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 27, 2015
Earnings Per Share	(3) Earnings Per Share Earnings per common share are based on the weighted average number of shares outstanding, including outstanding non-vested restricted stock. Diluted earnings per share are based on the weighted average number of common shares outstanding plus the incremental shares that would have been outstanding upon the assumed exercise of all dilutive stock options. The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per common share to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Average number of common shares outstanding 44,240 45,171 43,892 44,935 Incremental shares from assumed exercises of stock options 157 191 141 193 Average number of common shares and common share equivalents outstanding 44,397 45,362 44,033 45,128 For each of the twenty-six-week and thirteen-week periods ended June 27, 2015 and June 28, 2014, no options outstanding to purchase shares of common stock were antidilutive. Outstanding RSUs were excluded from the calculation of diluted earnings per share for all periods because the performance metric requirements for vesting had not been satisfied.

Additional Cash Flow Informatio

Additional Cash Flow Information	6 Months Ended
	Jun. 27, 2015
Additional Cash Flow Information	(4) Additional Cash Flow Information During the 2015 twenty-six-week period, Landstar paid income taxes and interest of $32,013,000 and $1,521,000, respectively. During the 2014 twenty-six-week period, Landstar paid income taxes and interest of $56,425,000 and $1,530,000, respectively. Landstar did not acquire any operating property by entering into capital leases in the 2015 twenty-six-week period. Landstar acquired operating property by entering into capital leases in the amount of $11,410,000 in the 2014 twenty-six-week period.

Segment Information

Segment Information	6 Months Ended
	Jun. 27, 2015
Segment Information	(5) Segment Information The following table summarizes information about the Company’s reportable business segments as of and for the twenty-six-week and thirteen-week periods ended June 27, 2015 and June 28, 2014 (in thousands): Twenty Six Weeks Ended June 27, 2015 June 28, 2014 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 1,609,225 $ 21,538 $ 1,630,763 $ 1,483,673 $ 18,967 $ 1,502,640 Investment income 693 693 695 695 Internal revenue 18,554 18,554 16,582 16,582 Operating income 101,113 13,965 115,078 92,202 11,384 103,586 Expenditures on long-lived assets 3,050 3,050 1,354 1,354 Goodwill 31,134 31,134 31,134 31,134 Thirteen Weeks Ended June 27, 2015 June 28, 2014 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 857,429 $ 10,954 $ 868,383 $ 804,820 $ 9,623 $ 814,443 Investment income 339 339 332 332 Internal revenue 12,158 12,158 10,790 10,790 Operating income 57,383 8,650 66,033 53,218 5,354 58,572 Expenditures on long-lived assets 600 600 622 622 In the twenty-six and thirteen-week periods ended June 27, 2015 and June 28, 2014, no single customer accounted for more than 10% of the Company’s consolidated revenue.

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Jun. 27, 2015
Other Comprehensive Income	(6) Other Comprehensive Income The following table presents the components of and changes in accumulated other comprehensive income, net of related income taxes, as of and for the twenty-six-week period ended June 27, 2015 (in thousands): Unrealized Holding Gain on Available-for-Sale Foreign Currency Total Balance as of December 27, 2014 $ 105 $ (1,290 ) $ (1,185 ) Other comprehensive income (loss) 64 (698 ) (634 ) Balance as of June 27, 2015 $ 169 $ (1,988 ) $ (1,819 ) Amounts reclassified from accumulated other comprehensive income to investment income due to the realization of previously unrealized gains and losses in the accompanying consolidated statements of income were not significant for the twenty-six-week period ended June 27, 2015.

Investments

Investments	6 Months Ended
	Jun. 27, 2015
Investments	(7) Investments Investments include primarily investment-grade corporate bonds and U.S. Treasury obligations having maturities of up to five years (the “bond portfolio”). Investments in the bond portfolio are reported as available-for-sale and are carried at fair value. Investments maturing less than one year from the balance sheet date are included in short-term investments and investments maturing more than one year from the balance sheet date are included in other assets in the consolidated balance sheets. Management performs an analysis of the nature of the unrealized losses on available-for-sale investments to determine whether such losses are other-than-temporary. Unrealized losses, representing the excess of the purchase price of an investment over its fair value as of the end of a period, considered to be other-than-temporary, are to be included as a charge in the statement of income, while unrealized losses considered to be temporary are to be included as a component of shareholders’ equity. Investments whose values are based on quoted market prices in active markets are classified within Level 1. Investments that trade in markets that are not considered to be active, but are valued based on quoted market prices, are classified within Level 2. As Level 2 investments include positions that are not traded in active markets, valuations may be adjusted to reflect illiquidity and/or non-transferability, which are generally based on available market information. Any transfers between levels are recognized as of the beginning of any reporting period. Fair value of the bond portfolio was determined using Level 1 inputs related to U.S. Treasury obligations and money market investments and Level 2 inputs related to investment-grade corporate bonds, asset-backed securities and direct obligations of government agencies. Unrealized gains, net of unrealized losses, on the investments in the bond portfolio were $262,000 and $163,000 at June 27, 2015 and December 27, 2014, respectively. The amortized cost and fair values of available-for-sale investments are as follows at June 27, 2015 and December 27, 2014 (in thousands): Amortized Gross Gross Fair Value June 27, 2015 Money market investments $ 5,486 $ — $ — $ 5,486 Asset-backed securities 5,039 — 29 5,010 Corporate bonds and direct obligations of government agencies 76,231 393 113 76,511 U.S. Treasury obligations 19,628 13 2 19,639 Total $ 106,384 $ 406 $ 144 $ 106,646 December 27, 2014 Money market investments $ 1,729 $ — $ — $ 1,729 Asset-backed securities 5,106 1 50 5,057 Corporate bonds and direct obligations of government agencies 76,964 491 284 77,171 U.S. Treasury obligations 19,507 14 9 19,512 Total $ 103,306 $ 506 $ 343 $ 103,469 For those available-for-sale investments with unrealized losses at June 27, 2015 and December 27, 2014, the following table summarizes the duration of the unrealized loss (in thousands): Less than 12 months 12 months or longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 27, 2015 Asset-backed securities $ 5,010 $ 29 $ — $ — $ 5,010 $ 29 Corporate bonds and direct obligations of government agencies 21,786 102 3,503 11 25,289 113 U.S. Treasury obligations 1,266 2 — — 1,266 2 Total $ 28,062 $ 133 $ 3,503 $ 11 $ 31,565 $ 144 December 27, 2014 Asset-backed securities $ 2,006 $ 13 $ 2,447 $ 37 $ 4,453 $ 50 Corporate bonds and direct obligations of government agencies 19,354 135 11,373 149 30,727 284 U.S. Treasury obligations 6,992 1 760 8 7,752 9 Total $ 28,352 $ 149 $ 14,580 $ 194 $ 42,932 $ 343 The Company expects to recover the amortized cost basis of these securities as it does not intend to sell, and does not anticipate being required to sell, these securities before recovery of the cost basis. For these reasons, the Company does not consider the unrealized losses on these securities to be other-than-temporary at June 27, 2015.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 27, 2015
Commitments and Contingencies	(8) Commitments and Contingencies Short-term investments include $48,864,000 in current maturities of investments held by the Company’s insurance segment at June 27, 2015. The non-current portion of the bond portfolio of $57,782,000 is included in other assets. The short-term investments, together with $19,425,000 of non-current investments, provide collateral for the $61,460,000 of letters of credit issued to guarantee payment of insurance claims. As of June 27, 2015, Landstar also had $32,763,000 of additional letters of credit outstanding under the Company’s Credit Agreement. The Company is involved in certain claims and pending litigation arising from the normal conduct of business. Many of these claims are covered in whole or in part by insurance. Based on knowledge of the facts and, in certain cases, opinions of outside counsel, management believes that adequate provisions have been made for probable losses with respect to the resolution of all such claims and pending litigation and that the ultimate outcome, after provisions therefor, will not have a material adverse effect on the financial condition of the Company, but could have a material effect on the results of operations in a given quarter or year.

Change in Accounting Estimate f

Change in Accounting Estimate for Self-Insured Claims	6 Months Ended
	Jun. 27, 2015
Change in Accounting Estimate for Self-Insured Claims	(9) Change in Accounting Estimate for Self-Insured Claims Landstar provides for the estimated costs of self-insured claims primarily on an actuarial basis. The amount recorded for the estimated liability for claims incurred is based upon the facts and circumstances known on the applicable balance sheet date. The ultimate resolution of these claims may be for an amount greater or less than the amount estimated by management. The Company continually revises its existing claim estimates as new or revised information becomes available on the status of each claim. Historically, the Company has experienced both favorable and unfavorable development of prior years’ claims estimates. The following table summarizes the effect of the increase in the cost of insurance claims resulting from unfavorable development of prior year self-insured claims estimates on operating income, net income and earnings per share amounts in the consolidated statements of income for the twenty-six-week and thirteen-week periods ended June 27, 2015 and June 28, 2014 (in thousands, except per share amounts): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Operating income $ 5,474 $ 6,747 $ 833 $ 4,856 Net income 3,383 4,170 515 3,001 Earnings per share $ 0.08 $ 0.09 $ 0.01 $ 0.07 Diluted earnings per share $ 0.08 $ 0.09 $ 0.01 $ 0.07 The unfavorable development of prior years’ claims in the twenty-six-week period ended June 27, 2015 primarily related to the impact of the March 13, 2015 verdict further described in reports previously filed by the Company with the Securities and Exchange Commission.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 27, 2015
Recent Accounting Pronouncements	(10) Recent Accounting Pronouncements In May 2014, the Financial Accounting Standards Board issued Accounting Standards Update 2014-09 - Revenue from Contracts with Customers (“ASU 2014-09”). ASU 2014-09 is a comprehensive revenue recognition model requiring a company to recognize revenue to depict the transfer of goods or services to a customer at an amount reflecting the consideration it expects to receive in exchange for those goods or services. In adopting ASU 2014-09, companies may use either a full retrospective or a modified retrospective approach. On July 9, 2015, the FASB approved deferring the effective date by one year to December 15, 2017 for annual reporting periods beginning after that date. The FASB also approved permitting early adoption of the standard, but not before the original effective date of December 15, 2016. ASU 2014-09 is not expected to have a material impact on the Company’s financial statements.

Share-based Payment Arrangeme20

Share-based Payment Arrangements (Tables)	6 Months Ended
	Jun. 27, 2015
Amounts Recognized in Financial Statements with Respect to Plans	Amounts recognized in the financial statements with respect to these Plans are as follows (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Total cost of the Plans during the period $ 3,243 $ 2,799 $ 1,576 $ 1,635 Amount of related income tax benefit recognized during the period (1,270 ) (1,277 ) (569 ) (663 ) Net cost of the Plans during the period $ 1,973 $ 1,522 $ 1,007 $ 972
Summary of Information Regarding Stock Options	The following table summarizes information regarding the Company’s outstanding stock options under the Plans: Number of Weighted Average per Share Weighted Average Term (years) Aggregate Intrinsic Options outstanding at December 27, 2014 773,839 $ 46.92 Exercised (65,600 ) $ 45.59 Forfeited (1,000 ) $ 52.60 Options outstanding at June 27, 2015 707,239 $ 47.04 5.3 $ 14,225 Options exercisable at June 27, 2015 478,339 $ 45.06 4.7 $ 10,565
Restricted Stock Units (RSUs)
Schedule of Information on Restricted Stock Units	The following table summarizes information regarding the Company’s outstanding restricted stock unit (“RSU”) awards under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 27, 2014 425,630 $ 50.72 Granted 111,669 $ 53.31 Vested (91,382 ) $ 51.98 Outstanding at June 27, 2015 445,917 $ 51.11
Non-vested Restricted Stock
Schedule of Information on Non-Vested Restricted Stock	The following table summarizes information regarding the Company’s outstanding non-vested restricted stock under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 27, 2014 23,353 $ 54.90 Granted 1,197 $ 62.46 Vested (6,490 ) $ 57.79 Outstanding at June 27, 2015 18,060 $ 54.36

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 27, 2015
Reconciliation of Average Number of Common Shares Outstanding to Average Number of Diluted Shares Outstanding	The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per common share to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Average number of common shares outstanding 44,240 45,171 43,892 44,935 Incremental shares from assumed exercises of stock options 157 191 141 193 Average number of common shares and common share equivalents outstanding 44,397 45,362 44,033 45,128

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 27, 2015
Information Regarding Reportable Business Segments	The following table summarizes information about the Company’s reportable business segments as of and for the twenty-six-week and thirteen-week periods ended June 27, 2015 and June 28, 2014 (in thousands): Twenty Six Weeks Ended June 27, 2015 June 28, 2014 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 1,609,225 $ 21,538 $ 1,630,763 $ 1,483,673 $ 18,967 $ 1,502,640 Investment income 693 693 695 695 Internal revenue 18,554 18,554 16,582 16,582 Operating income 101,113 13,965 115,078 92,202 11,384 103,586 Expenditures on long-lived assets 3,050 3,050 1,354 1,354 Goodwill 31,134 31,134 31,134 31,134 Thirteen Weeks Ended June 27, 2015 June 28, 2014 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 857,429 $ 10,954 $ 868,383 $ 804,820 $ 9,623 $ 814,443 Investment income 339 339 332 332 Internal revenue 12,158 12,158 10,790 10,790 Operating income 57,383 8,650 66,033 53,218 5,354 58,572 Expenditures on long-lived assets 600 600 622 622

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 27, 2015
Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes	The following table presents the components of and changes in accumulated other comprehensive income, net of related income taxes, as of and for the twenty-six-week period ended June 27, 2015 (in thousands): Unrealized Holding Gain on Available-for-Sale Foreign Currency Total Balance as of December 27, 2014 $ 105 $ (1,290 ) $ (1,185 ) Other comprehensive income (loss) 64 (698 ) (634 ) Balance as of June 27, 2015 $ 169 $ (1,988 ) $ (1,819 )

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 27, 2015
Amortized Cost and Fair Value of Available for Sale Investments	The amortized cost and fair values of available-for-sale investments are as follows at June 27, 2015 and December 27, 2014 (in thousands): Amortized Gross Gross Fair Value June 27, 2015 Money market investments $ 5,486 $ — $ — $ 5,486 Asset-backed securities 5,039 — 29 5,010 Corporate bonds and direct obligations of government agencies 76,231 393 113 76,511 U.S. Treasury obligations 19,628 13 2 19,639 Total $ 106,384 $ 406 $ 144 $ 106,646 December 27, 2014 Money market investments $ 1,729 $ — $ — $ 1,729 Asset-backed securities 5,106 1 50 5,057 Corporate bonds and direct obligations of government agencies 76,964 491 284 77,171 U.S. Treasury obligations 19,507 14 9 19,512 Total $ 103,306 $ 506 $ 343 $ 103,469
Schedule of Unrealized Loss on Available for Sale Investments	For those available-for-sale investments with unrealized losses at June 27, 2015 and December 27, 2014, the following table summarizes the duration of the unrealized loss (in thousands): Less than 12 months 12 months or longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 27, 2015 Asset-backed securities $ 5,010 $ 29 $ — $ — $ 5,010 $ 29 Corporate bonds and direct obligations of government agencies 21,786 102 3,503 11 25,289 113 U.S. Treasury obligations 1,266 2 — — 1,266 2 Total $ 28,062 $ 133 $ 3,503 $ 11 $ 31,565 $ 144 December 27, 2014 Asset-backed securities $ 2,006 $ 13 $ 2,447 $ 37 $ 4,453 $ 50 Corporate bonds and direct obligations of government agencies 19,354 135 11,373 149 30,727 284 U.S. Treasury obligations 6,992 1 760 8 7,752 9 Total $ 28,352 $ 149 $ 14,580 $ 194 $ 42,932 $ 343

Change in Accounting Estimate25

Change in Accounting Estimate for Self-Insured Claims (Tables)	6 Months Ended
	Jun. 27, 2015
Effect of Increase in Cost of Insurance and Claims	The following table summarizes the effect of the increase in the cost of insurance claims resulting from unfavorable development of prior year self-insured claims estimates on operating income, net income and earnings per share amounts in the consolidated statements of income for the twenty-six-week and thirteen-week periods ended June 27, 2015 and June 28, 2014 (in thousands, except per share amounts): Twenty Six Weeks Ended Thirteen Weeks Ended June 27, 2015 June 28, 2014 June 27, 2015 June 28, 2014 Operating income $ 5,474 $ 6,747 $ 833 $ 4,856 Net income 3,383 4,170 515 3,001 Earnings per share $ 0.08 $ 0.09 $ 0.01 $ 0.07 Diluted earnings per share $ 0.08 $ 0.09 $ 0.01 $ 0.07

Share Based Payment Arrangement

Share Based Payment Arrangements - Additional Information (Detail)	May. 01, 2015shares	Jun. 27, 2015USD ($)EquityPlanshares	Jun. 28, 2014USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employee equity incentive plans | EquityPlan		2
Income tax benefit realized on disqualifying dispositions of stock acquired by exercise of incentive stock options		$ 213,000	$ 464,000
2013 Directors Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance | shares		115,000
Common stock reserved for issuance | shares		94,334
Other Stock Compensation Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance | shares		5,555,519
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Discount rate on stock awards		7.00%	7.00%
Stock awards granted | shares		111,669
Recognized share-based compensation expense		$ 2,246,000	$ 1,588,000
Unrecognized compensation cost expected to be recognized over period, years		3 years 2 months 12 days
Restricted Stock Units (RSUs) | May 2015 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted | shares	20,000
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 26,174,000
Restricted Stock Units (RSUs) | Maximum | January 2015 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU awards vesting period		5 years
Maximum percentage of target available for common share issuance		200.00%
Restricted Stock Units (RSUs) | Maximum | Prior to 2015 grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU awards vesting period		5 years
Maximum percentage of target available for common share issuance		100.00%
Restricted Stock Units (RSUs) | Maximum | May 2015 Grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of target available for common share issuance	150.00%
Restricted Stock Units (RSUs) | Minimum | Prior to 2015 grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU awards vesting period		3 years
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost expected to be recognized over period, years		1 year 9 months 18 days
Total intrinsic value of stock options exercised during periods		$ 1,417,000	$ 6,386,000
Unrecognized compensation cost		$ 2,145,000
Non-vested Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted | shares		1,197
Unrecognized compensation cost		$ 661,000
Unrecognized compensation cost expected to be recognized over period, years		1 year 4 months 24 days
Terms of award		The Company's common stock on the date of grant and shares of non-vested restricted stock are generally subject to vesting in three equal annual installments or 100% on the fifth anniversary of the date of the grant.

Amounts Recognized in Financial

Amounts Recognized in Financial Statements with Respect to Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of the Plans during the period	$ 1,576	$ 1,635	$ 3,243	$ 2,799
Amount of related income tax benefit recognized during the period	(569)	(663)	(1,270)	(1,277)
Net cost of the Plans during the period	$ 1,007	$ 972	$ 1,973	$ 1,522

Schedule of Information on Rest

Schedule of Information on Restricted Stock Units (Detail) - 6 months ended Jun. 27, 2015 - Restricted Stock Units (RSUs) - $ / shares	Total
Number of Shares
Beginning Balance	425,630
Granted	111,669
Vested	(91,382)
Ending Balance	445,917
Weighted Average Grant Date Fair Value
Beginning Balance	$ 50.72
Granted	53.31
Vested	51.98
Ending Balance	$ 51.11

Summary of Information Regardin

Summary of Information Regarding Stock Options (Detail) - Jun. 27, 2015 - USD ($) $ / shares in Units, $ in Thousands	Total
Number of Options
Beginning Balance, number of options	773,839
Exercised, number of options	(65,600)
Forfeited, number of options	(1,000)
Ending Balance, number of options	707,239
Options exercisable at the ending, Number of Options	478,339
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share	$ 46.92
Exercised, Weighted Average Exercise Price per Share	45.59
Forfeited, Weighted Average Exercise Price per Share	52.60
Ending Balance, Weighted Average Exercise Price per Share	47.04
Options exercisable at June 27, 2015	$ 45.06
Weighted Average Remaining Contractual Term (years)
Options outstanding at June 27, 2015	5 years 3 months 18 days
Options exercisable at June 27, 2015	4 years 8 months 12 days
Aggregate Intrinsic Value
Options outstanding at June 27, 2015	$ 14,225
Options exercisable at June 27, 2015	$ 10,565

Schedule of Information on Non

Schedule of Information on Non - Vested Restricted Stock Units (Detail) - 6 months ended Jun. 27, 2015 - Non-vested Restricted Stock - $ / shares	Total
Number of Shares
Beginning Balance	23,353
Granted	1,197
Vested	(6,490)
Ending Balance	18,060
Weighted Average Grant Date Fair Value
Beginning Balance	$ 54.90
Granted	62.46
Vested	57.79
Ending Balance	$ 54.36

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2015
Income Taxes [Line Items]
Effective income tax rate	37.90%	37.70%
Scenario, Forecast
Income Taxes [Line Items]
Effective income tax rate			38.20%

Reconciliation of Average Numbe

Reconciliation of Average Number of Common Shares and Common Share Equivalents Outstanding (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average number of common shares outstanding	43,892,000	44,935,000	44,240,000	45,171,000
Incremental shares from assumed exercises of stock options	141,000	193,000	157,000	191,000
Average number of common shares and common share equivalents outstanding	44,033,000	45,128,000	44,397,000	45,362,000

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from calculation of diluted earnings per share, antidilutive	0	0

Additional Cash Flow Informat34

Additional Cash Flow Information - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014
Supplemental Cash Flow Information [Abstract]
Income taxes paid	$ 32,013,000	$ 56,425,000
Interest paid	1,521,000	1,530,000
Acquired operating property by capital leases	$ 0	$ 11,410,000

Information Regarding Reportabl

Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
Segment Reporting Information [Line Items]
External revenue	$ 868,383	$ 814,443	$ 1,630,763	$ 1,502,640
Investment income	339	332	693	695
Internal revenue	12,158	10,790	18,554	16,582
Operating income	66,033	58,572	115,078	103,586
Expenditures on long-lived assets	600	622	3,050	1,354
Goodwill	31,134	31,134	31,134	31,134	$ 31,134
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	857,429	804,820	1,609,225	1,483,673
Operating income	57,383	53,218	101,113	92,202
Expenditures on long-lived assets	600	622	3,050	1,354
Goodwill	31,134	31,134	31,134	31,134
Insurance
Segment Reporting Information [Line Items]
External revenue	10,954	9,623	21,538	18,967
Investment income	339	332	693	695
Internal revenue	12,158	10,790	18,554	16,582
Operating income	$ 8,650	$ 5,354	$ 13,965	$ 11,384

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 28, 2014	Jun. 27, 2015
Segment Reporting Information [Line Items]
Customers representing greater than 10% of consolidated revenue	No single customer accounted for more than 10% of the Company's consolidated revenue.	No single customer accounted for more than 10% of the Company's consolidated revenue.

Components of and Changes in Ac

Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (1,185)
Other comprehensive income (loss)	$ (582)	$ 294	(634)	$ (28)
Ending Balance	(1,819)		(1,819)
Unrealized Holding Gain on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			105
Other comprehensive income (loss)			64
Ending Balance	169		169
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(1,290)
Other comprehensive income (loss)			(698)
Ending Balance	$ (1,988)		$ (1,988)

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 27, 2015	Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]
Investments maximum maturity period	5 years
Unrealized gains, net of unrealized losses, on the investments in the bond portfolio	$ 262,000	$ 163,000

Amortized Cost and Fair Value o

Amortized Cost and Fair Value of Available for Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 106,384	$ 103,306
Gross Unrealized Gains	406	506
Gross Unrealized Losses	144	343
Fair Value	106,646	103,469
Money market investments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,486	1,729
Fair Value	5,486	1,729
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,039	5,106
Gross Unrealized Gains		1
Gross Unrealized Losses	29	50
Fair Value	5,010	5,057
Corporate bonds and direct obligations of government agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	76,231	76,964
Gross Unrealized Gains	393	491
Gross Unrealized Losses	113	284
Fair Value	76,511	77,171
U.S. Treasury Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,628	19,507
Gross Unrealized Gains	13	14
Gross Unrealized Losses	2	9
Fair Value	$ 19,639	$ 19,512

Schedule of Unrealized Loss on

Schedule of Unrealized Loss on Available for Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 27, 2015	Dec. 27, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	$ 28,062	$ 28,352
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	133	149
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	3,503	14,580
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	11	194
Available-for-sale investments with unrealized losses, Fair Value, Total	31,565	42,932
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	144	343
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	5,010	2,006
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	29	13
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value		2,447
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss		37
Available-for-sale investments with unrealized losses, Fair Value, Total	5,010	4,453
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	29	50
Corporate bonds and direct obligations of government agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	21,786	19,354
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	102	135
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	3,503	11,373
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	11	149
Available-for-sale investments with unrealized losses, Fair Value, Total	25,289	30,727
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	113	284
U.S. Treasury Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	1,266	6,992
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	2	1
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value		760
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss		8
Available-for-sale investments with unrealized losses, Fair Value, Total	1,266	7,752
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 2	$ 9

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Jun. 27, 2015USD ($)
Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	$ 32,763,000
Guarantee Payment Of Insurance Claims
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	61,460,000
Current Investments
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	48,864,000
Non-Current Investments
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	19,425,000
Total non-current investments	$ 57,782,000

Effect of Increase in Cost of I

Effect of Increase in Cost of Insurance and Claims (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Change in Accounting Estimate [Line Items]
Operating income	$ 66,033	$ 58,572	$ 115,078	$ 103,586
Net income	$ 40,471	$ 35,925	$ 70,486	$ 63,563
Earnings per share	$ 0.92	$ 0.80	$ 1.59	$ 1.41
Diluted earnings per share	$ 0.92	$ 0.80	$ 1.59	$ 1.40
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	$ 833	$ 4,856	$ 5,474	$ 6,747
Net income	$ 515	$ 3,001	$ 3,383	$ 4,170
Earnings per share	$ 0.01	$ 0.07	$ 0.08	$ 0.09
Diluted earnings per share	$ 0.01	$ 0.07	$ 0.08	$ 0.09