Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 1,033,000,000	$ 1,047,926,000
BCO Independent Contractor
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	43.00%	45.00%
Truck Brokerage Carriers
Disaggregation of Revenue [Line Items]
Consolidated revenue, percentage	49.00%	48.00%
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%	2.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue	$ 619,014,000	$ 656,135,000
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue	310,721,000	299,369,000
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue	$ 23,376,000	$ 23,584,000