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Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 28, 2020 | Mar. 30, 2019
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 927,566,000 | $ 1,033,000,000
BCO Independent Contractor |  |
Disaggregation of Revenue [Line Items] |  |
Consolidated revenue, percentage | 46.00% | 43.00%
Truck Brokerage Carriers |  |
Disaggregation of Revenue [Line Items] |  |
Consolidated revenue, percentage | 46.00% | 49.00%
Railroads |  |
Disaggregation of Revenue [Line Items] |  |
Consolidated revenue, percentage | 3.00% | 3.00%
Air and Ocean Cargo Carriers |  |
Disaggregation of Revenue [Line Items] |  |
Consolidated revenue, percentage | 3.00% | 3.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 545,307,000 | $ 619,014,000
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 286,328,000 | 310,721,000
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 22,941,000 | $ 23,376,000

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