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Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 24, 2011 | Jun. 25, 2011 | Mar. 26, 2011 | Dec. 29, 2012 | Dec. 31, 2011 | Dec. 25, 2010
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 691,256 |  | $ 717,168 |  | $ 735,973 |  | $ 649,023 |  | $ 717,522 |  | $ 684,013 |  | $ 675,561 |  | $ 571,986 |  | $ 2,793,420 | $ 2,649,082 | $ 2,400,170
Operating income | 49,535 |  | 54,379 |  | 58,789 |  | 43,150 |  | 50,950 |  | 49,533 |  | 48,670 |  | 34,092 |  | 205,853 | 183,245 | 139,971
Income before income taxes | 48,743 |  | 53,561 |  | 58,019 |  | 42,426 |  | 50,178 |  | 48,798 |  | 47,893 |  | 33,264 |  | 202,749 | 180,133 | 136,348
Income taxes | 14,765 |  | 20,460 |  | 22,164 |  | 15,579 |  | 17,546 |  | 18,640 |  | 18,295 |  | 12,707 |  | 72,968 | 67,188 | 49,766
Net income | 33,978 |  | 33,101 |  | 35,855 |  | 26,847 |  | 32,632 |  | 30,158 |  | 29,598 |  | 20,557 |  | 129,781 | 112,945 | 86,582
Less: Net loss attributable to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (62) |  |  | (62) | (932)
Net income attributable to Landstar System, Inc. and subsidiary |  |  |  |  |  |  |  |  | $ 32,632 |  | $ 30,158 |  | $ 29,598 |  | $ 20,619 |  | $ 129,781 | $ 113,007 | $ 87,514
Earnings per common share attributable to Landstar System, Inc. and subsidiary | $ 0.73 | [1] | $ 0.71 | [1] | $ 0.76 | [1] | $ 0.57 | [1] | $ 0.70 | [1] | $ 0.64 | [1] | $ 0.62 | [1] | $ 0.43 | [1] | $ 2.78 | $ 2.38 | $ 1.77
Diluted earnings per share attributable to Landstar System, Inc. and subsidiary | $ 0.73 | [1] | $ 0.71 | [1] | $ 0.76 | [1] | $ 0.57 | [1] | $ 0.70 | [1] | $ 0.64 | [1] | $ 0.62 | [1] | $ 0.43 | [1] | $ 2.77 | $ 2.38 | $ 1.77
Dividends paid per common share | $ 0.560 |  | $ 0.060 |  | $ 0.055 |  | $ 0.055 |  | $ 0.055 |  | $ 0.055 |  | $ 0.050 |  | $ 0.050 |  | $ 0.73 | $ 0.21 | $ 0.19
[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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