Schedule Of Revenue By Major Customers By Reporting Segments (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 29, 2025	Mar. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue		$ 1,152,502	$ 1,171,043
BCO Independent Contractors – Truck
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		37.00%	39.00%
Brokerage Carriers - Truck
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		54.00%	53.00%
Rail Intermodal
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		2.00%	2.00%
Ocean and air cargo carriers
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		6.00%	5.00%
BCO Independent Contractor Truck and Brokerage Carriers Truck | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue		$ 594,795	$ 628,304
BCO Independent Contractor Truck and Brokerage Carriers Truck | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue		340,408	343,045
BCO Independent Contractor Truck and Brokerage Carriers Truck | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue		22,436	25,617
BCO Independent Contractor Truck and Brokerage Carriers Truck | Other Truck Transportation
Disaggregation of Revenue [Line Items]
Revenue	[1]	$ 92,079	$ 71,966

[1] Includes power-only, expedited, straight truck, cargo van, and miscellaneous other truck transportation revenue generated by the transportation logistics segment. Power-only refers to shipments where the Company furnishes a power unit and an operator but not trailing equipment, which is typically provided by the shipper or consignee.