Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Product Information [Line Items]
Revenue	$ 1,202,081	$ 943,430	$ 3,432,793	$ 2,594,772
BCO Independent Contractor
Product Information [Line Items]
Consolidated revenue, percentage			44.00%
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			$ 2,086,523
BCO Independent Contractor and Truck Brokerage Carriers | Unsided/Platform Equipment
Product Information [Line Items]
Revenue			1,039,784
BCO Independent Contractor and Truck Brokerage Carriers | Less than Truckload
Product Information [Line Items]
Revenue			$ 76,448