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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.

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