Schedule Of Revenue By Major Customers By Reporting Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 1,816,132	$ 1,734,299	$ 5,761,795	$ 4,592,551
BCO Independent Contractors – Truck
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	35.00%	40.00%	35.00%	41.00%
Brokerage Carriers - Truck
Disaggregation of Revenue [Line Items]
Percentage of consolidated revenue	53.00%	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	9.00%	5.00%	8.00%	4.00%
BCO Independent Contractor Truck and Brokerage Carriers Truck | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue	$ 914,154	$ 918,115	$ 3,022,297	$ 2,502,025
BCO Independent Contractor Truck and Brokerage Carriers Truck | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue	453,924	422,979	1,336,956	1,112,358
BCO Independent Contractor Truck and Brokerage Carriers Truck | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue	35,343	30,819	105,994	85,551
BCO Independent Contractor Truck and Brokerage Carriers Truck | Other Truck Transportation
Disaggregation of Revenue [Line Items]
Revenue	$ 195,345	$ 208,817	$ 632,001	$ 518,472