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New Revenue Standard Requirements Impact of Adoption on Consolidated Income Statement and Balance Sheet (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,182,351 | $ 1,202,081 | $ 1,182,786 | $ 1,047,926 | $ 1,051,592 | $ 943,430 | $ 870,434 | $ 780,908 | $ 4,615,144 | $ 3,646,364 | $ 3,167,634 |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Purchased transportation |  |  |  |  |  |  |  |  | 3,569,961 | 2,805,109 | 2,415,663 |
Commissions to agents |  |  |  |  |  |  |  |  | 378,002 | 297,410 | 264,205 |
Income taxes | 16,889 | 19,304 | 20,095 | 16,880 | 4,759 | 17,490 | 22,689 | 18,868 | 73,168 | 63,806 | 82,107 |
Net income attributable to Landstar System, Inc. and subsidiary | 68,256 | $ 66,985 | $ 62,523 | $ 57,517 | 64,752 | $ 42,443 | $ 37,510 | $ 32,383 | 255,281 | 177,088 | 137,350 |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts receivable, net | 691,604 |  |  |  | 631,164 |  |  |  | 691,604 | 631,164 |  |
Other current assets | 16,287 |  |  |  | 14,394 |  |  |  | 16,287 | 14,394 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 314,134 |  |  |  | 285,132 |  |  |  | 314,134 | 285,132 |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 1,841,279 |  |  |  | 1,611,158 |  |  |  | 1,841,279 | 1,611,158 |  |
Transportation Logistics |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,562,796 | 3,599,382 | 3,121,210 |
Insurance |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 52,348 | 46,982 | $ 46,424 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Purchased transportation |  |  |  |  |  |  |  |  | 3,569,371 |  |  |
Commissions to agents |  |  |  |  |  |  |  |  | 378,011 |  |  |
Income taxes |  |  |  |  |  |  |  |  | 73,163 |  |  |
Net income attributable to Landstar System, Inc. and subsidiary |  |  |  |  |  |  |  |  | 255,264 |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts receivable, net | 681,122 |  |  |  | 631,164 |  |  |  | 681,122 | 631,164 |  | $ 641,043
Other current assets | 16,761 |  |  |  | 14,394 |  |  |  | 16,761 | 14,394 |  | 13,925
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 304,916 |  |  |  | 285,132 |  |  |  | 304,916 | 285,132 |  | 293,769
Equity |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | 1,840,489 |  |  |  | $ 1,611,158 |  |  |  | 1,840,489 | $ 1,611,158 |  | 1,611,931
Calculated under Revenue Guidance in Effect before Topic 606 | Transportation Logistics |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,562,193 |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 | Insurance |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 52,348 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  |  |
Purchased transportation |  |  |  |  |  |  |  |  | 590 |  |  |
Commissions to agents |  |  |  |  |  |  |  |  | (9) |  |  |
Income taxes |  |  |  |  |  |  |  |  | 5 |  |  |
Net income attributable to Landstar System, Inc. and subsidiary |  |  |  |  |  |  |  |  | 17 |  |  |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Trade accounts receivable, net | 10,482 |  |  |  |  |  |  |  | 10,482 |  |  | 9,879
Other current assets | (474) |  |  |  |  |  |  |  | (474) |  |  | (469)
Liabilities |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable | 9,218 |  |  |  |  |  |  |  | 9,218 |  |  | 8,637
Equity |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings | $ 790 |  |  |  |  |  |  |  | 790 |  |  | $ 773
Difference between Revenue Guidance in Effect before and after Topic 606 | Transportation Logistics | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 603 |  |  |

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