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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Schedule Of Quarterly Financial Data [Line Items]                      
Revenue $ 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
Operating income 86,088 87,068 83,426 75,153 70,049 60,567 61,018 52,334 331,735 243,968 223,251
Income before income taxes 85,189 86,252 82,587 74,353 69,442 59,910 60,199 51,251 328,381 240,802 219,457
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 68,300 66,948 62,492 57,473 64,683 42,420 37,510 32,383 255,213 176,996 137,350
Less: Net income/loss attributable to noncontrolling interest 44 (37) (31) (44) (69) (23)     68 92  
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
Earnings per common share attributable to Landstar System, Inc. and subsidiary $ 1.69 [1] $ 1.63 [1] $ 1.51 [1] $ 1.37 [1] $ 1.54 [1] $ 1.01 [1] $ 0.89 [1] $ 0.77 [1] $ 6.19 $ 4.22 $ 3.26
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary 1.68 [1] 1.63 [1] 1.51 [1] 1.37 [1] 1.54 [1] 1.01 [1] 0.89 [1] 0.77 [1] 6.18 4.21 3.25
Dividends per common share $ 0.165 $ 0.165 $ 0.150 $ 0.150 $ 1.60 $ 0.10 $ 0.09 $ 0.09 $ 0.63 $ 1.88 $ 0.34
[1] Due to the changes in the number of average common shares and common stock equivalents outstanding during the year, the sum of earnings per share amounts for each quarter do not necessarily sum in the aggregate to the earnings per share amounts for the full year.