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Information Regarding Reportable Business Segments (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External 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
Internal revenue |  |  |  |  |  |  |  |  | 37,110 | 36,118 | 31,342
Investment income |  |  |  |  |  |  |  |  | 2,498 | 1,502 | 1,396
Interest and debt expense |  |  |  |  |  |  |  |  | 3,166 | 3,794 | 2,949
Depreciation and amortization |  |  |  |  |  |  |  |  | 40,560 | 35,796 | 29,102
Operating income | 70,049 | $ 60,567 | $ 61,018 | $ 52,334 | 63,765 | $ 58,461 | $ 53,093 | $ 47,932 | 243,968 | 223,251 | 241,706
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 15,586 | 22,645 | 4,804
Goodwill | 39,065 |  |  |  | 31,134 |  |  |  | 39,065 | 31,134 | 31,134
Capital lease additions |  |  |  |  |  |  |  |  | 33,560 | 61,504 | 49,491
Total assets | 1,352,460 |  |  |  | 1,096,591 |  |  |  | 1,352,460 | 1,096,591 | 991,518
Transportation Logistics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 3,599,382 | 3,121,210 | 3,276,677
Interest and debt expense |  |  |  |  |  |  |  |  | 3,166 | 3,794 | 2,949
Depreciation and amortization |  |  |  |  |  |  |  |  | 40,560 | 35,796 | 29,102
Operating income |  |  |  |  |  |  |  |  | 209,615 | 187,813 | 207,883
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 15,586 | 22,645 | 4,804
Goodwill | 39,065 |  |  |  | 31,134 |  |  |  | 39,065 | 31,134 | 31,134
Capital lease additions |  |  |  |  |  |  |  |  | 33,560 | 61,504 | 49,491
Total assets | 1,132,766 |  |  |  | 913,667 |  |  |  | 1,132,766 | 913,667 | 842,550
Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 46,982 | 46,424 | 44,414
Internal revenue |  |  |  |  |  |  |  |  | 37,110 | 36,118 | 31,342
Investment income |  |  |  |  |  |  |  |  | 2,498 | 1,502 | 1,396
Operating income |  |  |  |  |  |  |  |  | 34,353 | 35,438 | 33,823
Total assets | $ 219,694 |  |  |  | $ 182,924 |  |  |  | $ 219,694 | $ 182,924 | $ 148,968

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