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Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 1,182,351,000 | $ 1,202,081,000 | $ 1,182,786,000 | $ 1,047,926,000 | $ 1,051,592,000 | $ 943,430,000 | $ 870,434,000 | $ 780,908,000 | $ 4,615,144,000 | $ 3,646,364,000 | $ 3,167,634,000
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets | 1,000,000 |  |  |  |  |  |  |  | 1,000,000 |  |
Lease obligations | $ 1,000,000 |  |  |  |  |  |  |  | $ 1,000,000 |  |
BCO Independent Contractor |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  | 43.00% |  |
Truck Brokerage Carriers |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  | 49.00% |  |
Railroads |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  | 3.00% |  |
Air and Ocean Cargo Carriers |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated revenue, percentage |  |  |  |  |  |  |  |  | 3.00% |  |
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 2,791,494,000 |  |
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,386,387,000 |  |
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload |  |  |  |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 102,531,000 |  |

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