Schedule Of Revenue By Major Customers By Reporting Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,975,064	$ 1,570,718	$ 3,945,663	$ 2,858,252
BCO Independent Contractors – Truck
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	35.00%	41.00%	36.00%	42.00%
Brokerage Carriers - Truck
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	54.00%	51.00%	53.00%	50.00%
Rail Intermodal
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	2.00%	3.00%	2.00%	3.00%
Ocean and air cargo carriers
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	8.00%	4.00%	8.00%	4.00%
BCO Independent Contractor Truck and Brokerage Carriers Truck | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue	$ 1,026,938	$ 854,509	$ 2,108,143	$ 1,583,911
BCO Independent Contractor Truck and Brokerage Carriers Truck | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue	474,274	391,893	883,032	689,378
BCO Independent Contractor Truck and Brokerage Carriers Truck | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue	36,931	29,062	70,651	54,732
BCO Independent Contractor Truck and Brokerage Carriers Truck | Other Truck Transportation
Disaggregation of Revenue [Line Items]
Revenue	$ 209,055	$ 168,723	$ 436,656	$ 309,655