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Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Schedule Of Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,051,592 |  | $ 943,430 |  | $ 870,434 |  | $ 780,908 |  | $ 892,829 |  | $ 787,938 |  | $ 775,223 |  | $ 711,644 |  | $ 3,646,364 | $ 3,167,634 | $ 3,321,091
Operating income | 70,049 |  | 60,567 |  | 61,018 |  | 52,334 |  | 63,765 |  | 58,461 |  | 53,093 |  | 47,932 |  | 243,968 | 223,251 | 241,706
Income before income taxes | 69,442 |  | 59,910 |  | 60,199 |  | 51,251 |  | 62,696 |  | 57,513 |  | 52,205 |  | 47,043 |  | 240,802 | 219,457 | 238,757
Income taxes | 4,759 |  | 17,490 |  | 22,689 |  | 18,868 |  | 23,122 |  | 21,235 |  | 19,891 |  | 17,859 |  | 63,806 | 82,107 | 91,068
Net income | 64,683 |  | 42,420 |  | 37,510 |  | 32,383 |  | $ 39,574 |  | $ 36,278 |  | $ 32,314 |  | $ 29,184 |  | 176,996 | 137,350 | 147,689
Less: Net loss attributable to noncontrolling interest | (69) |  | (23) |  |  |  |  |  |  |  |  |  |  |  |  |  | 92 |  |
Net income attributable to Landstar System, Inc. and subsidiary | $ 64,752 |  | $ 42,443 |  | $ 37,510 |  | $ 32,383 |  |  |  |  |  |  |  |  |  | $ 177,088 | $ 137,350 | $ 147,689
Earnings per common share attributable to Landstar System, Inc. and subsidiary | $ 1.54 | [1] | $ 1.01 | [1] | $ 0.89 | [1] | $ 0.77 | [1] | $ 0.95 | [1] | $ 0.86 | [1] | $ 0.77 | [1] | $ 0.69 | [1] | $ 4.22 | $ 3.26 | $ 3.38
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary | 1.54 | [1] | 1.01 | [1] | 0.89 | [1] | 0.77 | [1] | 0.94 | [1] | 0.86 | [1] | 0.76 | [1] | 0.69 | [1] | 4.21 | 3.25 | 3.37
Dividends per common share | $ 1.60 |  | $ 0.10 |  | $ 0.09 |  | $ 0.09 |  | $ 0.09 |  | $ 0.09 |  | $ 0.08 |  | $ 0.08 |  | $ 1.88 | $ 0.34 | $ 0.30
[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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