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Information Regarding Reportable Business Segments (Detail) (USD $) In Thousands, 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External 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
Internal revenue |  |  |  |  |  |  |  |  | 28,446 | 27,544 | 27,535
Investment income |  |  |  |  |  |  |  |  | 1,563 | 1,705 | 1,558
Interest and debt expense |  |  |  |  |  |  |  |  | 3,104 | 3,112 | 3,623
Depreciation and amortization |  |  |  |  |  |  |  |  | 27,456 | 25,814 | 24,804
Operating income | 49,535 | 54,379 | 58,789 | 43,150 | 50,950 | 49,533 | 48,670 | 34,092 | 205,853 | 183,245 | 139,971
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 7,072 | 4,337 | 27,505
Goodwill | 57,470 |  |  |  | 57,470 |  |  |  | 57,470 | 57,470 | 57,470
Capital lease additions |  |  |  |  |  |  |  |  | 43,077 | 34,044 | 14,986
Total assets | 879,421 |  |  |  | 808,449 |  |  |  | 879,421 | 808,449 | 683,882
Transportation Logistics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 2,757,559 | 2,614,739 | 2,366,032
Interest and debt expense |  |  |  |  |  |  |  |  | 3,104 | 3,112 | 3,623
Depreciation and amortization |  |  |  |  |  |  |  |  | 27,456 | 25,814 | 24,804
Operating income |  |  |  |  |  |  |  |  | 172,740 | 156,354 | 116,512
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 7,072 | 4,337 | 27,505
Goodwill | 57,470 |  |  |  | 57,470 |  |  |  | 57,470 | 57,470 | 57,470
Capital lease additions |  |  |  |  |  |  |  |  | 43,077 | 34,044 | 14,986
Total assets | 708,233 |  |  |  | 647,002 |  |  |  | 708,233 | 647,002 | 576,334
Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 35,861 | 34,343 | 34,138
Internal revenue |  |  |  |  |  |  |  |  | 28,446 | 27,544 | 27,535
Investment income |  |  |  |  |  |  |  |  | 1,563 | 1,705 | 1,558
Operating income |  |  |  |  |  |  |  |  | 33,113 | 26,891 | 23,459
Total assets | $ 171,188 |  |  |  | $ 161,447 |  |  |  | $ 171,188 | $ 161,447 | $ 107,548

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