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Information Regarding Reportable Business Segments (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 28, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | $ 4,084,577,000 | $ 4,615,144,000 | $ 3,646,364,000
Internal revenue |  |  |  |  |  |  |  |  | 46,587,000 | 37,872,000 | 37,110,000
Investment income |  |  |  |  |  |  |  |  | 5,041,000 | 3,816,000 | 2,498,000
Interest and debt expense |  |  |  |  |  |  |  |  | 3,141,000 | 3,354,000 | 3,166,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 44,468,000 | 43,570,000 | 40,560,000
Operating income | $ 66,519,000 | $ 70,638,000 | $ 80,851,000 | $ 80,896,000 | $ 86,088,000 | $ 87,068,000 | $ 83,426,000 | $ 75,153,000 | 298,904,000 | 331,735,000 | 243,968,000
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 19,416,000 | 9,747,000 | 15,586,000
Goodwill | 38,508,000 |  |  |  | 38,232,000 |  |  |  | 38,508,000 | 38,232,000 | 39,065,000
Finance lease additions |  |  |  |  |  |  |  |  | 29,054,000 | 46,595,000 | 33,560,000
Total assets | 1,427,711,000 |  |  |  | 1,380,564,000 |  |  |  | 1,427,711,000 | 1,380,564,000 | 1,352,460,000
Transportation Logistics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 4,028,336,000 | 4,562,796,000 | 3,599,382,000
Interest and debt expense |  |  |  |  |  |  |  |  | 3,141,000 | 3,354,000 | 3,166,000
Depreciation and amortization |  |  |  |  |  |  |  |  | 44,468,000 | 43,570,000 | 40,560,000
Operating income |  |  |  |  |  |  |  |  | 258,742,000 | 303,426,000 | 209,615,000
Expenditures on long-lived assets |  |  |  |  |  |  |  |  | 19,416,000 | 9,747,000 | 15,586,000
Goodwill | 38,508,000 |  |  |  | 38,232,000 |  |  |  | 38,508,000 | 38,232,000 | 39,065,000
Finance lease additions |  |  |  |  |  |  |  |  | 29,054,000 | 46,595,000 | 33,560,000
Total assets | 1,168,944,000 |  |  |  | 1,175,040,000 |  |  |  | 1,168,944,000 | 1,175,040,000 | 1,132,766,000
Insurance |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
External revenue |  |  |  |  |  |  |  |  | 56,241,000 | 52,348,000 | 46,982,000
Internal revenue |  |  |  |  |  |  |  |  | 46,587,000 | 37,872,000 | 37,110,000
Investment income |  |  |  |  |  |  |  |  | 5,041,000 | 3,816,000 | 2,498,000
Operating income |  |  |  |  |  |  |  |  | 40,162,000 | 28,309,000 | 34,353,000
Total assets | $ 258,767,000 |  |  |  | $ 205,524,000 |  |  |  | $ 258,767,000 | $ 205,524,000 | $ 219,694,000

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