Landstar System (LSTR) 10-Q 3 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 23, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
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	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		41,092,882

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Current Assets
Cash and cash equivalents	$ 148,641	$ 242,416
Short-term investments	40,323	48,928
Trade accounts receivable, less allowance of $6,549 and $6,131	688,961	631,164
Other receivables, including advances to independent contractors, less allowance of $6,495 and $6,012	20,737	24,301
Other current assets	29,553	14,394
Total current assets	928,215	961,203
Operating property, less accumulated depreciation and amortization of $232,760 and $218,700	256,096	276,011
Goodwill	38,704	39,065
Other assets	85,880	76,181
Total assets	1,308,895	1,352,460
Current Liabilities
Cash overdraft	45,365	42,242
Accounts payable	311,768	285,132
Current maturities of long-term debt	38,869	42,051
Insurance claims	42,546	38,919
Dividends payable		62,985
Accrued compensation	19,041	30,103
Other current liabilities	51,285	47,211
Total current liabilities	508,874	548,643
Long-term debt, excluding current maturities	65,093	83,062
Insurance claims	30,205	30,141
Deferred income taxes and other noncurrent liabilities	43,790	36,737
Equity
Landstar System, Inc. and subsidiary shareholders' equity Common stock, $0.01 par value, authorized 160,000,000 shares, issued 67,847,692 and 67,740,380 shares	678	677
Additional paid-in capital	216,328	209,599
Retained earnings	1,719,475	1,611,158
Cost of 26,754,810 and 25,749,493 shares of common stock in treasury	(1,273,489)	(1,167,600)
Accumulated other comprehensive loss	(5,284)	(3,162)
Total Landstar System, Inc. and subsidiary shareholders' equity	657,708	650,672
Noncontrolling interest	3,225	3,205
Total equity	660,933	653,877
Total liabilities and equity	$ 1,308,895	$ 1,352,460

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Allowance on trade accounts receivable	$ 6,549	$ 6,131
Allowance on other receivables	6,495	6,012
Accumulated depreciation and amortization on operating property	$ 232,760	$ 218,700
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized shares	160,000,000	160,000,000
Common stock, issued shares	67,847,692	67,740,380
Treasury stock, shares	26,754,810	25,749,493

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Revenue	$ 1,182,786	$ 870,434	$ 2,230,712	$ 1,651,342
Investment income	891	608	1,752	1,022
Costs and expenses:
Purchased transportation	916,940	667,588	1,727,237	1,263,111
Commissions to agents	94,399	70,282	176,524	134,080
Other operating costs, net of gains on asset sales/dispositions	7,606	7,503	15,210	14,400
Insurance and claims	21,539	13,893	38,899	28,406
Selling, general and administrative	48,998	40,861	94,249	79,184
Depreciation and amortization	10,769	9,897	21,766	19,831
Total costs and expenses	1,100,251	810,024	2,073,885	1,539,012
Operating income	83,426	61,018	158,579	113,352
Interest and debt expense	839	819	1,639	1,902
Income before income taxes	82,587	60,199	156,940	111,450
Income taxes	20,095	22,689	36,975	41,557
Net income	62,492	37,510	119,965	69,893
Less: Net loss attributable to noncontrolling interest	(31)		(75)
Net income attributable to Landstar System, Inc. and subsidiary	$ 62,523	$ 37,510	$ 120,040	$ 69,893
Earnings per common share attributable to Landstar System, Inc. and subsidiary	$ 1.51	$ 0.89	$ 2.88	$ 1.67
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 1.51	$ 0.89	$ 2.87	$ 1.66
Average number of shares outstanding:
Earnings per common share	41,450,000	41,935,000	41,744,000	41,907,000
Diluted earnings per share	41,491,000	42,010,000	41,795,000	42,004,000
Dividends per common share	$ 0.15	$ 0.09	$ 0.30	$ 0.18

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Net income attributable to Landstar System, Inc. and subsidiary	$ 62,523	$ 37,510	$ 120,040	$ 69,893
Other comprehensive (loss) income:
Unrealized holding (losses) gains on available-for-sale investments, net of tax (benefit) expense of ($233), $89, ($42) and $54	(153)	101	(883)	165
Foreign currency translation (losses) gains	(1,580)	448	(1,239)	585
Other comprehensive (loss) income	(1,733)	549	(2,122)	750
Comprehensive income attributable to Landstar System, Inc. and subsidiary	$ 60,790	$ 38,059	$ 117,918	$ 70,643

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Unrealized holding (losses) gains on available-for-sale investments, tax (benefit) expense	$ (42)	$ 54	$ (233)	$ 89

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
OPERATING ACTIVITIES
Net income	$ 119,965	$ 69,893
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of operating property and intangible assets	21,766	19,831
Non-cash interest charges	126	127
Provisions for losses on trade and other accounts receivable	4,297	3,601
Gains on sales/disposals of operating property	(988)	(701)
Deferred income taxes, net	5,585	1,766
Stock-based compensation	8,102	2,237
Changes in operating assets and liabilities:
Increase in trade and other accounts receivable	(48,651)	(22,917)
Increase in other assets	(16,537)	(12,658)
Increase in accounts payable	20,161	8,829
(Decrease) increase in other liabilities	(4,488)	3,316
Increase in insurance claims	3,691	6,475
NET CASH PROVIDED BY OPERATING ACTIVITIES	113,029	79,799
INVESTING ACTIVITIES
Sales and maturities of investments	18,399	33,486
Purchases of investments	(19,653)	(34,360)
Purchases of operating property	(4,121)	(6,628)
Proceeds from sales of operating property	2,939	2,793
NET CASH USED BY INVESTING ACTIVITIES	(2,436)	(4,709)
FINANCING ACTIVITIES
Increase (decrease) in cash overdraft	3,123	(2,106)
Dividends paid	(75,481)	(7,544)
Proceeds from exercises of stock options	1,039	1,962
Taxes paid in lieu of shares issued related to stock-based compensation plans	(2,812)	(365)
Purchases of common stock	(105,488)
Principal payments on capital lease obligations	(22,768)	(24,417)
Payment of contingent consideration	(985)
NET CASH USED BY FINANCING ACTIVITIES	(203,372)	(32,470)
Effect of exchange rate changes on cash and cash equivalents	(996)	585
(Decrease) increase in cash and cash equivalents	(93,775)	43,205
Cash and cash equivalents at beginning of period	242,416	178,897
Cash and cash equivalents at end of period	$ 148,641	$ 222,102

Consolidated Statement of Chang

Consolidated Statement of Changes in Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Treasury Stock at Cost	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning Balance (in shares) at Dec. 30, 2017		67,740,380			25,749,493
Beginning Balance at Dec. 30, 2017	$ 653,877	$ 677	$ 209,599	$ 1,611,158	$ (1,167,600)	$ (3,162)	$ 3,205
Net income (loss)	119,965			120,040			(75)
Dividends	(12,496)			(12,496)
Purchases of common stock (in shares)					1,000,000
Purchases of common stock	(105,488)				$ (105,488)
Issuance of stock related to stock-based compensation plans (in shares)		107,312			5,317
Issuance of stock related to stock-based compensation plans	(1,773)	$ 1	(1,373)		$ (401)
Stock-based compensation	8,102		8,102
Other comprehensive (loss) income	(2,027)					(2,122)	95
Ending Balance (in shares) at Jun. 30, 2018		67,847,692			26,754,810
Ending Balance at Jun. 30, 2018	660,933	$ 678	$ 216,328	1,719,475	$ (1,273,489)	$ (5,284)	$ 3,225
Adoption of accounting standards (Note 12) | Accounting Standards Update 2014-09	$ 773			$ 773

Consolidated Statement of Chan9

Consolidated Statement of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Dividends per common share	$ 0.15	$ 0.09	$ 0.30	$ 0.18

Business Description

Business Description	6 Months Ended
	Jun. 30, 2018
Business Description	The consolidated financial statements include the accounts of Landstar System, Inc. and its subsidiary, Landstar System Holdings, Inc., and reflect all adjustments (all of a normal, recurring nature) which are, in the opinion of management, necessary for a fair statement of the results for the periods presented. The preparation of the consolidated financial statements requires the use of management’s estimates. Actual results could differ from those estimates. Landstar System, Inc. and its subsidiary are herein referred to as “Landstar” or the “Company.” Significant intercompany accounts have been eliminated in consolidation. Landstar owns, through various subsidiaries, a controlling interest in Landstar Metro, S.A.P.I. de C.V., a transportation logistics company (“Landstar Metro”), and Landstar Metro Servicios S.A.P.I. de C.V., a services company (“Landstar Servicios”), each based in Mexico City, Mexico. Given Landstar’s controlling interest in each of Landstar Metro and Landstar Servicios, the accounts of Landstar Metro and Landstar Servicios have been consolidated herein and a noncontrolling interest has been recorded for the noncontrolling investors’ interests in the net assets and operations of Landstar Metro and Landstar Servicios. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update 2014-09 Revenue from Contracts with Customers 2014-09”). 2014-09 10-K

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 2018
Significant Accounting Policies	(1) Significant Accounting Policies Revenue Recognition The Company recognizes revenue from customer contracts based on relative transit time in each reporting period as the performance obligation is satisfied. As a result, a portion of the total revenue that will be billed to the customer once a load is delivered is recognized in each reporting period based on the percentage of total transit time that has been completed at the end of the reporting period. When providing the physical transportation of freight, the Company is the primary obligor with respect to freight delivery. Accordingly, the transportation revenue billed to customers for the physical transportation of freight and the related direct freight expenses are recognized on a gross basis over the transit period as the performance obligation is satisfied.

Acquired Business and Noncontro

Acquired Business and Noncontrolling Interests	6 Months Ended
	Jun. 30, 2018
Acquired Business and Noncontrolling Interests	(2) Acquired Business and Noncontrolling Interests During 2017, the Company incorporated each of Landstar Metro and Landstar Servicios. On September 20, 2017, Landstar Metro acquired substantially all of the assets of the asset-light transportation logistics business of Fletes Avella, S.A. de C.V., a Mexican transportation logistics company (the “Mexican Asset Acquisition”). At June 30, 2018 and December 30, 2017, there was approximately $700,000 and $1,900,000, respectively, in liabilities outstanding consisting of additional contingent purchase price and associated indirect taxes. In connection with the Mexican Asset Acquisition, individuals affiliated with the seller subscribed in the aggregate for a 30% equity interest in each of Landstar Metro and Landstar Servicios. The Mexican Asset Acquisition was accounted for as a business combination in accordance with Accounting Standards Codification 805, Business Combinations As it relates to the noncontrolling interests of Landstar Metro and Landstar Servicios, the Company has the option to purchase, and the minority equityholders have the option to sell, during the period commencing on the third anniversary of September 20, 2017, the closing date of the subscription by the minority equityholders (the “Closing Date”), and at any time after the fourth anniversary of the Closing Date, at fair value all but not less than all of the noncontrolling interests in Landstar Metro and Landstar Servicios. The noncontrolling interests are also subject to customary restrictions on transfer, including a right of first refusal in favor of the Company.

Share-based Payment Arrangement

Share-based Payment Arrangements	6 Months Ended
	Jun. 30, 2018
Share-based Payment Arrangements	(3) Share-based Payment Arrangements As of June 30, 2018, 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 Amended and Restated 2013 Directors Stock Compensation Plan (as amended and restated as of May 17, 2016, the “2013 DSCP”). 6,000,000 shares of the Company’s common stock were authorized for issuance under the 2011 EIP and 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 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Total cost of the Plans during the period $ 8,102 $ 2,237 $ 4,392 $ 1,243 Amount of related income tax benefit recognized during the period (3,468 ) (1,814 ) (1,217 ) (687 ) Net cost of the Plans during the period $ 4,634 $ 423 $ 3,175 $ 556 Included in income tax benefits recognized in the twenty-six-week twenty-six-week As of June 30, 2018, there were 72,742 shares of the Company’s common stock reserved for issuance under the 2013 DSCP and 4,486,031 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 with either a performance condition or a market condition under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 30, 2017 387,372 $ 55.75 Granted 65,228 $ 96.20 Vested (67,971 ) $ 53.92 Forfeited (92,880 ) $ 52.36 Outstanding at June 30, 2018 291,749 $ 66.30 During the twenty-six-week 10-K. RSUs with a performance condition granted on February 2, 2018 may vest on January 31 of 2021, 2022 and 2023 based on growth in operating income and pre-tax On April 24, 2018, the Company granted 9,324 RSUs that vest based on a market condition. These RSUs may vest on June 30 of 2022, 2023 and 2024 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 April 24, 2018 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 $6,975,000 and $1,309,000 of share-based compensation expense related to RSU awards in the twenty-six-week Stock Options The following table summarizes information regarding the Company’s outstanding stock options under the Plans: Weighted Average Number of Weighted Average Remaining Aggregate Intrinsic Options per Share Term (years) Value (000s) Options outstanding at December 30, 2017 189,040 $ 49.34 Exercised (51,918 ) $ 48.52 Options outstanding at June 30, 2018 137,122 $ 49.64 3.5 $ 8,166 Options exercisable at June 30, 2018 136,122 $ 49.58 3.5 $ 8,115 The total intrinsic value of stock options exercised during the twenty-six-week As of June 30, 2018, there was no unrecognized compensation cost related to non-vested Non-vested The following table summarizes information regarding the Company’s outstanding shares of non-vested Number of Shares and Deferred Stock Weighted Average Grant Date Fair Value Non-vested 54,755 $ 78.02 Granted 22,803 $ 113.35 Vested (19,162 ) $ 74.42 Forfeited (1,757 ) $ 71.12 Non-vested 56,639 $ 93.68 The fair value of each share of non-vested non-vested As of June 30, 2018, there was $4,327,000 of total unrecognized compensation cost related to non-vested non-vested

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Taxes	(4) Income Taxes The Tax Cuts and Jobs Act (the “Tax Reform Act”) permanently reduced the U.S. corporate income tax rate from a maximum of 35% to a flat 21% rate, effective January 1, 2018. The provisions for income taxes for the 2018 and 2017 twenty-six-week twenty-six-week twenty-six-week twenty-six-week non-deductible

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share	(5) Earnings Per Share Earnings per common share attributable to Landstar System, Inc. and subsidiary are based on the weighted average number of shares outstanding, including outstanding non-vested The following table provides a reconciliation of the average number of common shares outstanding used to calculate earnings per common share attributable to Landstar System, Inc. and subsidiary to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share attributable to Landstar System, Inc. and subsidiary (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Average number of common shares outstanding 41,744 41,907 41,450 41,935 Incremental shares from assumed exercises of stock options 51 97 41 75 Average number of common shares and common share equivalents outstanding 41,795 42,004 41,491 42,010 For each of the twenty-six-week

Additional Cash Flow Informatio

Additional Cash Flow Information	6 Months Ended
	Jun. 30, 2018
Additional Cash Flow Information	(6) Additional Cash Flow Information During the 2018 twenty-six-week twenty-six-week twenty-six-week twenty-six-week

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2018
Segment Information	(7) Segment Information The following table summarizes information about the Company’s reportable business segments as of and for the twenty-six-week Twenty Six Weeks Ended June 30, 2018 July 1, 2017 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 2,205,561 $ 25,151 $ 2,230,712 $ 1,628,155 $ 23,187 $ 1,651,342 Internal revenue 22,917 22,917 22,438 22,438 Investment income 1,752 1,752 1,022 1,022 Operating income 146,298 12,281 158,579 94,512 18,840 113,352 Expenditures on long-lived assets 4,121 4,121 6,628 6,628 Goodwill 38,704 38,704 31,134 31,134 Thirteen Weeks Ended June 30, 2018 July 1, 2017 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 1,169,921 $ 12,865 $ 1,182,786 $ 858,807 $ 11,627 $ 870,434 Internal revenue 15,419 15,419 15,104 15,104 Investment income 891 891 608 608 Operating income 78,998 4,428 83,426 50,398 10,620 61,018 Expenditures on long-lived assets 307 307 1,650 1,650 In the twenty-six-week

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2018
Other Comprehensive Income	(8) Other Comprehensive Income The following table presents the components of and changes in accumulated other comprehensive income attributable to Landstar System, Inc. and subsidiary, net of related income taxes, as of and for the twenty-six-week Unrealized Available-for-Sale Foreign Currency Total Balance as of December 30, 2017 $ (144 ) $ (3,018 ) $ (3,162 ) Other comprehensive loss (883 ) (1,239 ) (2,122 ) Balance as of June 30, 2018 $ (1,027 ) $ (4,257 ) $ (5,284 ) 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

Investments

Investments	6 Months Ended
	Jun. 30, 2018
Investments	(9) Investments Investments include primarily investment-grade corporate bonds having maturities of up to five years (the “bond portfolio”) and money market investments. Investments in the bond portfolio are reported as available-for-sale available-for-sale non-transferability, The amortized cost and fair values of available-for-sale Amortized Gross Gross Fair Value June 30, 2018 Money market investments $ 16,912 $ — $ — $ 16,912 Asset-backed securities 1,206 — 7 1,199 Corporate bonds and direct obligations of government agencies 94,101 11 1,312 92,800 Total $ 112,219 $ 11 $ 1,319 $ 110,911 December 30, 2017 Money market investments $ 27,895 $ — $ — $ 27,895 Asset-backed securities 2,805 — 5 2,800 Corporate bonds and direct obligations of government agencies 80,442 117 335 80,224 Total $ 111,142 $ 117 $ 340 $ 110,919 For those available-for-sale Less than 12 months 12 months or longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 30, 2018 Asset-backed securities $ 1,199 $ 7 $ — $ — $ 1,199 $ 7 Corporate bonds and direct obligations of government agencies 79,404 1,137 8,640 175 88,044 1,312 Total $ 80,603 $ 1,144 $ 8,640 $ 175 $ 89,243 $ 1,319 December 30, 2017 Asset-backed securities $ 1,864 $ 4 $ 632 $ 1 $ 2,496 $ 5 Corporate bonds and direct obligations of government agencies 41,322 220 14,016 115 55,338 335 Total $ 43,186 $ 224 $ 14,648 $ 116 $ 57,834 $ 340 The Company believes unrealized losses on investments were primarily caused by rising interest rates rather than changes in credit quality. 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 30, 2018.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies	(10) Commitments and Contingencies Short-term investments include $40,323,000 in current maturities of investments held by the Company’s insurance segment at June 30, 2018. The non-current non-current During 2017, the Company incorporated each of Landstar Metro and Landstar Servicios. On September 20, 2017, Landstar Metro acquired substantially all of the assets of the asset-light transportation logistics business of Fletes Avella, S.A. de C.V., a Mexican transportation logistics company. In connection with the acquisition, individuals affiliated with the seller subscribed in the aggregate for a 30% equity interest in each of Landstar Metro and Landstar Servicios. As it relates to the noncontrolling interests of Landstar Metro and Landstar Servicios, the Company has the option to purchase, and the minority equityholders have the option to sell, during the period commencing on the third anniversary of September 20, 2017, the closing date of the subscription by the minority equityholders (the “Closing Date”), and at any time after the fourth anniversary of the Closing Date, at fair value all but not less than all of the noncontrolling interests in Landstar Metro and Landstar Servicios. The noncontrolling interests are also subject to customary restrictions on transfer, including a right of first refusal in favor of the Company. 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. 30, 2018
Change in Accounting Estimate for Self-Insured Claims	(11) 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 attributable to Landstar System, Inc. and subsidiary and earnings per share attributable to Landstar System, Inc. and subsidiary amounts in the consolidated statements of income for the twenty-six-week Twenty Six Weeks Ended Thirteen Weeks Ended June 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Operating income $ 8,244 $ 203 $ 5,686 $ 307 Net income attributable to Landstar System, Inc. and subsidiary 6,224 125 4,293 189 Earnings per share attributable to Landstar System, Inc. and subsidiary $ 0.15 — $ 0.10 — Diluted earnings per share attributable to Landstar System, Inc. and subsidiary $ 0.15 — $ 0.10 — The unfavorable development of prior years’ claims in the thirteen-week period ended June 30, 2018 was primarily attributable to three claims.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	6 Months Ended
	Jun. 30, 2018
Recent Accounting Pronouncements	(12) Recent Accounting Pronouncements Adoption of New Accounting Standards In May 2014, the FASB issued ASU 2014-09. 2014-09 2014-09 2014-09 twenty-six-week twenty-six-week The cumulative effect of the changes made to our consolidated December 31, 2017 balance sheet for the adoption of ASU 2014-09 Balance at December 30, 2017 Adjustments Due to ASU 2014-09 Balance at December 31, 2017 Balance Sheet Assets Trade accounts receivable, net $ 631,164 $ 9,879 $ 641,043 Other current assets 14,394 (469 ) 13,925 Liabilities Accounts payable 285,132 8,637 293,769 Equity Retained earnings 1,611,158 773 1,611,931 In accordance with the new revenue standard requirements, the impact of adoption on our consolidated income statement and balance sheet was as follows (in thousands): For the twenty six weeks ended June 30, 2018 As Reported Balances Without 2014-09 Effect of Change Income statement Revenues Transportation $ 2,205,561 $ 2,201,260 $ 4,301 Insurance 25,151 25,151 — Costs and expenses Purchased transportation 1,727,237 1,723,814 3,423 Commissions to agents 176,524 176,222 302 Income taxes 36,975 36,834 141 Net income attributable to Landstar System, Inc. and subsidiary 120,040 119,605 435 June 30, 2018 As Reported Balances Without 2014-09 Effect of Change Balance Sheet Assets Trade accounts receivable, net $ 688,961 $ 674,781 $ 14,180 Other current assets 29,553 30,163 (610 ) Liabilities Accounts payable 311,768 299,406 12,362 Equity Retained earnings 1,719,475 1,718,267 1,208 Accounting Standards Issued But Not Yet Adopted In February 2016, the FASB issued Accounting Standards Update 2016-02 Leases 2016-02”). 2016-02 right-of-use 2016-02 2016-02 In June 2016, the FASB issued Accounting Standards Update 2016-13– Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments 2016-13”), 2016-13 2016-13

Significant Accounting Polici23

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2018
Revenue Recognition	Revenue Recognition The Company recognizes revenue from customer contracts based on relative transit time in each reporting period as the performance obligation is satisfied. As a result, a portion of the total revenue that will be billed to the customer once a load is delivered is recognized in each reporting period based on the percentage of total transit time that has been completed at the end of the reporting period. When providing the physical transportation of freight, the Company is the primary obligor with respect to freight delivery. Accordingly, the transportation revenue billed to customers for the physical transportation of freight and the related direct freight expenses are recognized on a gross basis over the transit period as the performance obligation is satisfied.

Share-based Payment Arrangeme24

Share-based Payment Arrangements (Tables)	6 Months Ended
	Jun. 30, 2018
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 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Total cost of the Plans during the period $ 8,102 $ 2,237 $ 4,392 $ 1,243 Amount of related income tax benefit recognized during the period (3,468 ) (1,814 ) (1,217 ) (687 ) Net cost of the Plans during the period $ 4,634 $ 423 $ 3,175 $ 556
Summary of Information Regarding Stock Options	The following table summarizes information regarding the Company’s outstanding stock options under the Plans: Weighted Average Number of Weighted Average Remaining Aggregate Intrinsic Options per Share Term (years) Value (000s) Options outstanding at December 30, 2017 189,040 $ 49.34 Exercised (51,918 ) $ 48.52 Options outstanding at June 30, 2018 137,122 $ 49.64 3.5 $ 8,166 Options exercisable at June 30, 2018 136,122 $ 49.58 3.5 $ 8,115
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 with either a performance condition or a market condition under the Plans: Number of Weighted Average Grant Date Fair Value Outstanding at December 30, 2017 387,372 $ 55.75 Granted 65,228 $ 96.20 Vested (67,971 ) $ 53.92 Forfeited (92,880 ) $ 52.36 Outstanding at June 30, 2018 291,749 $ 66.30
Non Vested Restricted Stock and Deferred Stock Units
Schedule of Information on Non-Vested Restricted Stock and Deferred Stock Units	The following table summarizes information regarding the Company’s outstanding shares of non-vested Number of Shares and Deferred Stock Weighted Average Grant Date Fair Value Non-vested 54,755 $ 78.02 Granted 22,803 $ 113.35 Vested (19,162 ) $ 74.42 Forfeited (1,757 ) $ 71.12 Non-vested 56,639 $ 93.68

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
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 attributable to Landstar System, Inc. and subsidiary to the average number of common shares and common share equivalents outstanding used to calculate diluted earnings per share attributable to Landstar System, Inc. and subsidiary (in thousands): Twenty Six Weeks Ended Thirteen Weeks Ended June 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Average number of common shares outstanding 41,744 41,907 41,450 41,935 Incremental shares from assumed exercises of stock options 51 97 41 75 Average number of common shares and common share equivalents outstanding 41,795 42,004 41,491 42,010

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2018
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 Twenty Six Weeks Ended June 30, 2018 July 1, 2017 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 2,205,561 $ 25,151 $ 2,230,712 $ 1,628,155 $ 23,187 $ 1,651,342 Internal revenue 22,917 22,917 22,438 22,438 Investment income 1,752 1,752 1,022 1,022 Operating income 146,298 12,281 158,579 94,512 18,840 113,352 Expenditures on long-lived assets 4,121 4,121 6,628 6,628 Goodwill 38,704 38,704 31,134 31,134 Thirteen Weeks Ended June 30, 2018 July 1, 2017 Transportation Logistics Insurance Total Transportation Logistics Insurance Total External revenue $ 1,169,921 $ 12,865 $ 1,182,786 $ 858,807 $ 11,627 $ 870,434 Internal revenue 15,419 15,419 15,104 15,104 Investment income 891 891 608 608 Operating income 78,998 4,428 83,426 50,398 10,620 61,018 Expenditures on long-lived assets 307 307 1,650 1,650

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2018
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 attributable to Landstar System, Inc. and subsidiary, net of related income taxes, as of and for the twenty-six-week Unrealized Available-for-Sale Foreign Currency Total Balance as of December 30, 2017 $ (144 ) $ (3,018 ) $ (3,162 ) Other comprehensive loss (883 ) (1,239 ) (2,122 ) Balance as of June 30, 2018 $ (1,027 ) $ (4,257 ) $ (5,284 )

Investments (Tables)

Investments (Tables)	6 Months Ended
	Jun. 30, 2018
Amortized Cost and Fair Value of Available-for-Sale Investments	The amortized cost and fair values of available-for-sale Amortized Gross Gross Fair Value June 30, 2018 Money market investments $ 16,912 $ — $ — $ 16,912 Asset-backed securities 1,206 — 7 1,199 Corporate bonds and direct obligations of government agencies 94,101 11 1,312 92,800 Total $ 112,219 $ 11 $ 1,319 $ 110,911 December 30, 2017 Money market investments $ 27,895 $ — $ — $ 27,895 Asset-backed securities 2,805 — 5 2,800 Corporate bonds and direct obligations of government agencies 80,442 117 335 80,224 Total $ 111,142 $ 117 $ 340 $ 110,919
Schedule of Unrealized Loss on Available-for-Sale Investments	For those available-for-sale Less than 12 months 12 months or longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss June 30, 2018 Asset-backed securities $ 1,199 $ 7 $ — $ — $ 1,199 $ 7 Corporate bonds and direct obligations of government agencies 79,404 1,137 8,640 175 88,044 1,312 Total $ 80,603 $ 1,144 $ 8,640 $ 175 $ 89,243 $ 1,319 December 30, 2017 Asset-backed securities $ 1,864 $ 4 $ 632 $ 1 $ 2,496 $ 5 Corporate bonds and direct obligations of government agencies 41,322 220 14,016 115 55,338 335 Total $ 43,186 $ 224 $ 14,648 $ 116 $ 57,834 $ 340

Change in Accounting Estimate29

Change in Accounting Estimate for Self-Insured Claims (Tables)	6 Months Ended
	Jun. 30, 2018
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 attributable to Landstar System, Inc. and subsidiary and earnings per share attributable to Landstar System, Inc. and subsidiary amounts in the consolidated statements of income for the twenty-six-week Twenty Six Weeks Ended Thirteen Weeks Ended June 30, 2018 July 1, 2017 June 30, 2018 July 1, 2017 Operating income $ 8,244 $ 203 $ 5,686 $ 307 Net income attributable to Landstar System, Inc. and subsidiary 6,224 125 4,293 189 Earnings per share attributable to Landstar System, Inc. and subsidiary $ 0.15 — $ 0.10 — Diluted earnings per share attributable to Landstar System, Inc. and subsidiary $ 0.15 — $ 0.10 —

Recent Accounting Pronounceme30

Recent Accounting Pronouncements (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Standards Update 2014-09
Adoption of New Accounting Standards	The cumulative effect of the changes made to our consolidated December 31, 2017 balance sheet for the adoption of ASU 2014-09 Balance at December 30, 2017 Adjustments Due to ASU 2014-09 Balance at December 31, 2017 Balance Sheet Assets Trade accounts receivable, net $ 631,164 $ 9,879 $ 641,043 Other current assets 14,394 (469 ) 13,925 Liabilities Accounts payable 285,132 8,637 293,769 Equity Retained earnings 1,611,158 773 1,611,931 In accordance with the new revenue standard requirements, the impact of adoption on our consolidated income statement and balance sheet was as follows (in thousands): For the twenty six weeks ended June 30, 2018 As Reported Balances Without 2014-09 Effect of Change Income statement Revenues Transportation $ 2,205,561 $ 2,201,260 $ 4,301 Insurance 25,151 25,151 — Costs and expenses Purchased transportation 1,727,237 1,723,814 3,423 Commissions to agents 176,524 176,222 302 Income taxes 36,975 36,834 141 Net income attributable to Landstar System, Inc. and subsidiary 120,040 119,605 435 June 30, 2018 As Reported Balances Without 2014-09 Effect of Change Balance Sheet Assets Trade accounts receivable, net $ 688,961 $ 674,781 $ 14,180 Other current assets 29,553 30,163 (610 ) Liabilities Accounts payable 311,768 299,406 12,362 Equity Retained earnings 1,719,475 1,718,267 1,208

Business Description - Addition

Business Description - Additional Information (Detail)	Jun. 30, 2018USD ($)
Accounting Standards Update 2014-09 | Retained Earnings
Description of Business [Line Items]
Cumulative adjustment to retained earnings	$ 773,000

Acquired Business and Noncont32

Acquired Business and Noncontrolling Interests - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Dec. 30, 2017	Sep. 20, 2017	Jul. 01, 2017
Goodwill	$ 38,704,000	$ 39,065,000		$ 31,134,000
Fletes Avella | Landstar Metro
Business combination, recognized identifiable assets acquired and liabilities assumed, liabilities	700,000	$ 1,900,000
Ownership interest acquired by affiliates			30.00%
Goodwill	$ 8,500,000
Percentage of goodwill estimated to be deductible for tax purposes	70.00%
Percentage of goodwill estimated to be deductible after purchase of noncontrolling interests by the company	100.00%
Fletes Avella | Landstar Servicios
Ownership interest acquired by affiliates			30.00%

Share-based Payment Arrangeme33

Share-based Payment Arrangements - Additional Information (Detail) $ in Thousands	Apr. 24, 2018shares	Jun. 30, 2018USD ($)EquityPlanshares	Jul. 01, 2017USD ($)
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		$ 64	$ 270
Maximum percentage of target available for common share issuance	150.00%
Accounting Standards Update 2016-09
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefit from stock-based awards		$ 1,426	751
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		72,742
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted, shares | shares	9,324	65,228
Recognized share-based compensation expense		$ 6,975	1,309
Unrecognized compensation cost expected to be recognized over period, years		3 years 6 months
Non Vested Restricted Stock and Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted, shares | shares		22,803
Unrecognized compensation cost, other than options		$ 4,327
Unrecognized compensation cost expected to be recognized over period, years		2 years 6 months
Terms of award		The Company’s common stock on the date of grant. Shares of non-vested restricted stock are generally subject to vesting in three equal annual installments either on the first, second and third anniversary of the date of the grant or the third, fourth and fifth anniversary of the date of the grant, or 100% on the first anniversary of the date of the grant. For restricted stock awards granted under the 2013 DSCP plan, each recipient may elect to defer receipt of shares and instead receive restricted stock units (“Deferred Stock Units”), which represent contingent rights to receive shares of the Company’s common stock on the date of recipient separation from service from the Board of Directors, or, if earlier, upon a change in control event of the Company. Deferred Stock Units become vested 100% on the first anniversary of the date of the grant.
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options exercised during periods		$ 3,203	$ 4,480
Unrecognized compensation cost, stock options		0
Maximum | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, other than options		$ 27,400
2011 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance | shares		6,000,000
2013 Directors Stock Compensation Plan | Deferred Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock vesting percentage		100.00%
Other Stock Compensation Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance | shares		4,486,031

Amounts Recognized in Financial

Amounts Recognized in Financial Statements with Respect to Plans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total cost of the Plans during the period	$ 4,392	$ 1,243	$ 8,102	$ 2,237
Amount of related income tax benefit recognized during the period	(1,217)	(687)	(3,468)	(1,814)
Net cost of the Plans during the period	$ 3,175	$ 556	$ 4,634	$ 423

Schedule of Information on Rest

Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - $ / shares	Apr. 24, 2018	Jun. 30, 2018
Number of Shares
Beginning Balance		387,372
Granted	9,324	65,228
Vested		(67,971)
Forfeited		(92,880)
Ending Balance		291,749
Weighted Average Grant Date Fair Value
Beginning Balance		$ 55.75
Granted		96.20
Vested		53.92
Forfeited		52.36
Ending Balance		$ 66.30

Summary of Information Regardin

Summary of Information Regarding Stock Options (Detail) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)$ / sharesshares
Number of Options
Beginning Balance, number of options | shares	189,040
Exercised, number of options | shares	(51,918)
Ending Balance, number of options | shares	137,122
Options exercisable at the ending, Number of Options | shares	136,122
Weighted Average Exercise Price per Share
Beginning Balance, Weighted Average Exercise Price per Share | $ / shares	$ 49.34
Exercised, Weighted Average Exercise Price per Share | $ / shares	48.52
Ending Balance, Weighted Average Exercise Price per Share | $ / shares	49.64
Options exercisable at June 30, 2018 | $ / shares	$ 49.58
Weighted Average Remaining Contractual Term (years)
Options outstanding at June 30, 2018	3 years 6 months
Options exercisable at June 30, 2018	3 years 6 months
Aggregate Intrinsic Value
Options outstanding at June 30, 2018 | $	$ 8,166
Options exercisable at June 30, 2018 | $	$ 8,115

Schedule of Information on Non

Schedule of Information on Non - Vested Restricted Stock Units (Detail) - Non Vested Restricted Stock and Deferred Stock Units	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Number of Shares and Deferred Stock Units
Beginning Balance | shares	54,755
Granted | shares	22,803
Vested | shares	(19,162)
Forfeited | shares	(1,757)
Ending Balance | shares	56,639
Weighted Average Grant Date Fair Value
Beginning Balance | $ / shares	$ 78.02
Granted | $ / shares	113.35
Vested | $ / shares	74.42
Forfeited | $ / shares	71.12
Ending Balance | $ / shares	$ 93.68

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Income Taxes [Line Items]
Corporate income tax rate	21.00%		35.00%
Estimated annual effective income tax rate	24.50%	38.20%
Effective income tax rate	23.60%	37.30%

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. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average number of common shares outstanding	41,450,000	41,935,000	41,744,000	41,907,000
Incremental shares from assumed exercises of stock options	41,000	75,000	51,000	97,000
Average number of common shares and common share equivalents outstanding	41,491,000	42,010,000	41,795,000	42,004,000

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017
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 Informat41

Additional Cash Flow Information - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Supplemental Cash Flow Information [Abstract]
Income taxes paid			$ 40,062	$ 45,559
Interest paid			1,886	2,062
Acquired operating property by capital leases			1,617	5,108
Payment to acquire operating property	$ 307	$ 1,650	4,121	$ 6,628
Laredo, TX
Supplemental Cash Flow Information [Abstract]
Payment to acquire operating property			$ 2,162

Information Regarding Reportabl

Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 30, 2017
Segment Reporting Information [Line Items]
External revenue	$ 1,182,786	$ 870,434	$ 2,230,712	$ 1,651,342
Internal revenue	15,419	15,104	22,917	22,438
Investment income	891	608	1,752	1,022
Operating income	83,426	61,018	158,579	113,352
Expenditures on long-lived assets	307	1,650	4,121	6,628
Goodwill	38,704	31,134	38,704	31,134	$ 39,065
Transportation Logistics
Segment Reporting Information [Line Items]
External revenue	1,169,921	858,807	2,205,561	1,628,155
Operating income	78,998	50,398	146,298	94,512
Expenditures on long-lived assets	307	1,650	4,121	6,628
Goodwill	38,704	31,134	38,704	31,134
Insurance
Segment Reporting Information [Line Items]
External revenue	12,865	11,627	25,151	23,187
Internal revenue	15,419	15,104	22,917	22,438
Investment income	891	608	1,752	1,022
Operating income	$ 4,428	$ 10,620	$ 12,281	$ 18,840

Segment Information - Additiona

Segment Information - Additional Information (Detail) - Customer	3 Months Ended	6 Months Ended
	Jul. 01, 2017	Jun. 30, 2018
Segment Reporting Information [Line Items]
Number of customers accounting for 10 percent or more of total revenue	0	0
No single customer accounted for benchmark percentage to be considered major customer	10.00%	10.00%

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. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 650,672
Other comprehensive (loss)	$ (1,733)	$ 549	(2,122)	$ 750
Ending Balance	657,708		657,708
Unrealized Holding Losses on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(144)
Other comprehensive (loss)			(883)
Ending Balance	(1,027)		(1,027)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(3,018)
Other comprehensive (loss)			(1,239)
Ending Balance	(4,257)		(4,257)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(3,162)
Other comprehensive (loss)			(2,122)
Ending Balance	$ (5,284)		$ (5,284)

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Investments maximum maturity period	5 years
Unrealized losses, net of unrealized gains, on the investments in the bond portfolio	$ 1,308	$ 223

Amortized Cost and Fair Value o

Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 112,219	$ 111,142
Gross Unrealized Gains	11	117
Gross Unrealized Losses	1,319	340
Fair Value	110,911	110,919
Money market investments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,912	27,895
Fair Value	16,912	27,895
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,206	2,805
Gross Unrealized Losses	7	5
Fair Value	1,199	2,800
Corporate bonds and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	94,101	80,442
Gross Unrealized Gains	11	117
Gross Unrealized Losses	1,312	335
Fair Value	$ 92,800	$ 80,224

Schedule of Unrealized Loss on

Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	$ 80,603	$ 43,186
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	1,144	224
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	8,640	14,648
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	175	116
Available-for-sale investments with unrealized losses, Fair Value, Total	89,243	57,834
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	1,319	340
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	1,199	1,864
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	7	4
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value		632
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss		1
Available-for-sale investments with unrealized losses, Fair Value, Total	1,199	2,496
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	7	5
Corporate bonds and direct obligations of government agencies
Debt Securities, Available-for-sale [Line Items]
Available-for-sale investments with unrealized losses, Less than 12 months, Fair Value	79,404	41,322
Available-for-sale investments with unrealized losses, Less than 12 months, Unrealized Loss	1,137	220
Available-for-sale investments with unrealized losses, 12 months or longer, Fair Value	8,640	14,016
Available-for-sale investments with unrealized losses, 12 months or longer, Unrealized Loss	175	115
Available-for-sale investments with unrealized losses, Fair Value, Total	88,044	55,338
Available-for-sale investments with unrealized losses, Unrealized Loss, Total	$ 1,312	$ 335

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Sep. 20, 2017
Fletes Avella | Landstar Metro
Commitments and Contingencies Disclosure [Line Items]
Ownership interest acquired by affiliates		30.00%
Fletes Avella | Landstar Servicios
Commitments and Contingencies Disclosure [Line Items]
Ownership interest acquired by affiliates		30.00%
Revolving Credit Facility
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	$ 34,371
Guarantee Payment of Insurance Claims
Commitments and Contingencies Disclosure [Line Items]
Letters of credit outstanding	62,457
Current Investments | Collateral Pledged [Member]
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	40,323
Non-Current Investments
Commitments and Contingencies Disclosure [Line Items]
Total non-current investments	70,588
Non-Current Investments | Collateral Pledged [Member]
Commitments and Contingencies Disclosure [Line Items]
Investments providing collateral for letters of credit to guarantee insurance claims	$ 29,074

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. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Change in Accounting Estimate [Line Items]
Operating income	$ 83,426	$ 61,018	$ 158,579	$ 113,352
Net income attributable to Landstar System, Inc. and subsidiary	$ 62,523	$ 37,510	$ 120,040	$ 69,893
Earnings per share attributable to Landstar System, Inc. and subsidiary	$ 1.51	$ 0.89	$ 2.88	$ 1.67
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 1.51	$ 0.89	$ 2.87	$ 1.66
Development of Prior Year Self Insured Claims Estimates
Change in Accounting Estimate [Line Items]
Operating income	$ 5,686	$ 307	$ 8,244	$ 203
Net income attributable to Landstar System, Inc. and subsidiary	$ 4,293	$ 189	$ 6,224	$ 125
Earnings per share attributable to Landstar System, Inc. and subsidiary	$ 0.10		$ 0.15
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary	$ 0.10		$ 0.15

Recent Accounting Pronounceme50

Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Product Information [Line Items]
Revenue	$ 1,182,786	$ 870,434	$ 2,230,712	$ 1,651,342
BCO Independent Contractor
Product Information [Line Items]
Consolidated revenue, percentage			45.00%
Truck Brokerage Carriers
Product Information [Line Items]
Consolidated revenue, percentage			49.00%
Railroads
Product Information [Line Items]
Consolidated revenue, percentage			3.00%
Air and Ocean Cargo Carriers
Product Information [Line Items]
Consolidated revenue, percentage			2.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment
Product Information [Line Items]
Revenue			$ 1,369,476
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Product Information [Line Items]
Revenue			664,045
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Product Information [Line Items]
Revenue			$ 50,948

Cumulative Effect of Changes Ma

Cumulative Effect of Changes Made to Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Dec. 30, 2017
ASSETS
Trade accounts receivable	$ 688,961	$ 641,043	$ 631,164
Other current assets, net	29,553	13,925	14,394
Liabilities
Accounts payable	311,768	293,769	285,132
Equity
Retained earnings	1,719,475	1,611,931	1,611,158
Calculated under Revenue Guidance in Effect before Topic 606
ASSETS
Trade accounts receivable	674,781		631,164
Other current assets, net	30,163		14,394
Liabilities
Accounts payable	299,406		285,132
Equity
Retained earnings	1,718,267		$ 1,611,158
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
ASSETS
Trade accounts receivable	14,180	9,879
Other current assets, net	(610)	(469)
Liabilities
Accounts payable	12,362	8,637
Equity
Retained earnings	$ 1,208	$ 773

New Revenue Standard Requiremen

New Revenue Standard Requirements Impact of Adoption on Consolidated Income Statement and Balance Sheet (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Dec. 31, 2017	Dec. 30, 2017
Revenues
Revenues	$ 1,182,786	$ 870,434	$ 2,230,712	$ 1,651,342
Costs and expenses
Purchased transportation	916,940	667,588	1,727,237	1,263,111
Commissions to agents	94,399	70,282	176,524	134,080
Income taxes	20,095	22,689	36,975	41,557
Net income attributable to Landstar System, Inc. and subsidiary	62,523	37,510	120,040	69,893
ASSETS
Trade accounts receivable, net	688,961		688,961		$ 641,043	$ 631,164
Other current assets	29,553		29,553		13,925	14,394
Liabilities
Accounts payable	311,768		311,768		293,769	285,132
Equity
Retained earnings	1,719,475		1,719,475		1,611,931	1,611,158
Transportation Logistics
Revenues
Revenues	1,169,921	858,807	2,205,561	1,628,155
Insurance
Revenues
Revenues	12,865	$ 11,627	25,151	$ 23,187
Calculated under Revenue Guidance in Effect before Topic 606
Costs and expenses
Purchased transportation			1,723,814
Commissions to agents			176,222
Income taxes			36,834
Net income attributable to Landstar System, Inc. and subsidiary			119,605
ASSETS
Trade accounts receivable, net	674,781		674,781			631,164
Other current assets	30,163		30,163			14,394
Liabilities
Accounts payable	299,406		299,406			285,132
Equity
Retained earnings	1,718,267		1,718,267			$ 1,611,158
Calculated under Revenue Guidance in Effect before Topic 606 | Transportation Logistics
Revenues
Revenues			2,201,260
Calculated under Revenue Guidance in Effect before Topic 606 | Insurance
Revenues
Revenues			25,151
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Costs and expenses
Purchased transportation			3,423
Commissions to agents			302
Income taxes			141
Net income attributable to Landstar System, Inc. and subsidiary			435
ASSETS
Trade accounts receivable, net	14,180		14,180		9,879
Other current assets	(610)		(610)		(469)
Liabilities
Accounts payable	12,362		12,362		8,637
Equity
Retained earnings	$ 1,208		1,208		$ 773
Difference between Revenue Guidance in Effect before and after Topic 606 | Transportation Logistics | Accounting Standards Update 2014-09
Revenues
Revenues			$ 4,301