Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Product Information [Line Items]
Revenue	$ 1,047,926	$ 780,908
BCO Independent Contractor
Product Information [Line Items]
Consolidated revenue, percentage	45.00%
Truck Brokerage Carriers
Product Information [Line Items]
Consolidated revenue, percentage	48.00%
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	$ 656,135
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Product Information [Line Items]
Revenue	299,369
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Product Information [Line Items]
Revenue	$ 23,584