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Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,011,658,000 | $ 1,202,081,000 | $ 3,089,698,000 | $ 3,432,793,000
BCO Independent Contractor |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated revenue, percentage | 46.00% | 43.00% | 45.00% | 44.00%
Truck Brokerage Carriers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated revenue, percentage | 46.00% | 50.00% | 47.00% | 49.00%
Railroads |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated revenue, percentage | 3.00% | 3.00% | 3.00% | 3.00%
Air and Ocean Cargo Carriers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Consolidated revenue, percentage | 3.00% | 3.00% | 3.00% | 2.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 575,042,000 | $ 717,047,000 | $ 1,799,421,000 | $ 2,086,523,000
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 331,787,000 | 375,739,000 | 980,615,000 | 1,039,784,000
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 25,367,000 | $ 25,500,000 | $ 73,475,000 | $ 76,448,000

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