Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Product Information [Line Items]
Revenue	$ 1,182,786	$ 870,434	$ 2,230,712	$ 1,651,342
BCO Independent Contractor
Product Information [Line Items]
Consolidated revenue, percentage			45.00%
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			2.00%
BCO Independent Contractor and Truck Brokerage Carriers | Van Equipment
Product Information [Line Items]
Revenue			$ 1,369,476
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Product Information [Line Items]
Revenue			664,045
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Product Information [Line Items]
Revenue			$ 50,948