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Segment Information (Information Regarding Reportable Business Segments) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 24, 2011 | Jun. 25, 2011 | Mar. 26, 2011 | Dec. 25, 2010 | Sep. 25, 2010 | Jun. 26, 2010 | Mar. 27, 2010 | Dec. 31, 2011 Cus | Dec. 25, 2010 Cus | Dec. 26, 2009 Cus
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue | $ 717,522,000 | $ 684,013,000 | $ 675,561,000 | $ 571,986,000 | $ 587,535,000 | $ 622,826,000 | $ 641,721,000 | $ 548,088,000 | $ 2,649,082,000 | $ 2,400,170,000 | $ 2,008,796,000
Internal revenue |  |  |  |  |  |  |  |  | 27,544,000 | 27,535,000 | 27,179,000
Investment income |  |  |  |  |  |  |  |  | 1,705,000 | 1,558,000 | 1,268,000
Interest and debt expense |  |  |  |  |  |  |  |  | 3,112,000 | 3,623,000 | 4,030,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 25,814,000 | 24,804,000 | 23,528,000
Operating income | 50,950,000 | 49,533,000 | 48,670,000 | 34,092,000 | 35,808,000 | 35,886,000 | 39,982,000 | 28,295,000 | 183,245,000 | 139,971,000 | 113,742,000
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 4,337,000 | 27,505,000 | 2,715,000
Goodwill | 57,470,000 |  |  |  | 57,470,000 |  |  |  | 57,470,000 | 57,470,000 | 57,470,000
Capital lease additions |  |  |  |  |  |  |  |  | 34,044,000 | 14,986,000 | 12,284,000
Total assets | 808,449,000 |  |  |  | 683,882,000 |  |  |  | 808,449,000 | 683,882,000 | 648,792,000
Number of customers accounting for 10 percent or more of total revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
Transportation Logistics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 2,614,739,000 | 2,366,032,000 | 1,972,863,000
Interest and debt expense |  |  |  |  |  |  |  |  | 3,112,000 | 3,623,000 | 4,030,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 25,814,000 | 24,804,000 | 23,528,000
Operating income |  |  |  |  |  |  |  |  | 156,354,000 | 116,512,000 | 88,176,000
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 4,337,000 | 27,505,000 | 2,715,000
Goodwill | 57,470,000 |  |  |  | 57,470,000 |  |  |  | 57,470,000 | 57,470,000 | 57,470,000
Capital lease additions |  |  |  |  |  |  |  |  | 34,044,000 | 14,986,000 | 12,284,000
Total assets | 647,002,000 |  |  |  | 576,334,000 |  |  |  | 647,002,000 | 576,334,000 | 524,584,000
Insurance [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 34,343,000 | 34,138,000 | 35,933,000
Internal revenue |  |  |  |  |  |  |  |  | 27,544,000 | 27,535,000 | 27,179,000
Investment income |  |  |  |  |  |  |  |  | 1,705,000 | 1,558,000 | 1,268,000
Operating income |  |  |  |  |  |  |  |  | 26,891,000 | 23,459,000 | 25,566,000
Total assets | $ 161,447,000 |  |  |  | $ 107,548,000 |  |  |  | $ 161,447,000 | $ 107,548,000 | $ 124,208,000

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