Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	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