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Information Regarding Reportable Business Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 24, 2016 | Jun. 25, 2016 | Mar. 26, 2016 | Dec. 26, 2015 | Sep. 26, 2015 | Jun. 27, 2015 | Mar. 28, 2015 | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue | $ 892,829 | $ 787,938 | $ 775,223 | $ 711,644 | $ 848,602 | $ 841,726 | $ 868,383 | $ 762,380 | $ 3,167,634 | $ 3,321,091 | $ 3,184,790
Internal revenue |  |  |  |  |  |  |  |  | 36,118 | 31,342 | 28,164
Investment income |  |  |  |  |  |  |  |  | 1,502 | 1,396 | 1,381
Interest and debt expense |  |  |  |  |  |  |  |  | 3,794 | 2,949 | 3,177
Depreciation and amortization |  |  |  |  |  |  |  |  | 35,796 | 29,102 | 27,575
Operating income | 63,765 | $ 58,461 | $ 53,093 | $ 47,932 | 62,648 | $ 63,980 | $ 66,033 | $ 49,045 | 223,251 | 241,706 | 224,372
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 22,645 | 4,804 | 10,539
Goodwill | 31,134 |  |  |  | 31,134 |  |  |  | 31,134 | 31,134 | 31,134
Capital lease additions |  |  |  |  |  |  |  |  | 61,504 | 49,491 | 47,232
Total assets | 1,096,591 |  |  |  | 991,518 |  |  |  | 1,096,591 | 991,518 | 1,037,616
Transportation Logistics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 3,121,210 | 3,276,677 | 3,145,413
Interest and debt expense |  |  |  |  |  |  |  |  | 3,794 | 2,949 | 3,177
Depreciation and amortization |  |  |  |  |  |  |  |  | 35,796 | 29,102 | 27,575
Operating income |  |  |  |  |  |  |  |  | 187,813 | 207,883 | 193,914
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 22,645 | 4,804 | 10,539
Goodwill | 31,134 |  |  |  | 31,134 |  |  |  | 31,134 | 31,134 | 31,134
Capital lease additions |  |  |  |  |  |  |  |  | 61,504 | 49,491 | 47,232
Total assets | 913,667 |  |  |  | 842,550 |  |  |  | 913,667 | 842,550 | 911,193
Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 46,424 | 44,414 | 39,377
Internal revenue |  |  |  |  |  |  |  |  | 36,118 | 31,342 | 28,164
Investment income |  |  |  |  |  |  |  |  | 1,502 | 1,396 | 1,381
Operating income |  |  |  |  |  |  |  |  | 35,438 | 33,823 | 30,458
Total assets | $ 182,924 |  |  |  | $ 148,968 |  |  |  | $ 182,924 | $ 148,968 | $ 126,423

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