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Schedule Of Revenue By Major Customers By Reporting Segments (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Revenue		$ 1,205,406	$ 1,213,867	$ 3,569,291	$ 3,609,915
BCO Independent Contractors – Truck
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		38.00%	38.00%	38.00%	38.00%
Brokerage Carriers - Truck
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		52.00%	52.00%	54.00%	52.00%
Rail Intermodal
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		2.00%	2.00%	2.00%	2.00%
Ocean and air cargo carriers
Disaggregation of Revenue [Line Items]
Percentage of Consolidated Revenue		6.00%	6.00%	5.00%	6.00%
BCO Independent Contractor Truck and Brokerage Carriers Truck | Van Equipment
Disaggregation of Revenue [Line Items]
Revenue		$ 583,369	$ 603,993	$ 1,769,440	$ 1,851,237
BCO Independent Contractor Truck and Brokerage Carriers Truck | Unsided/Platform Equipment
Disaggregation of Revenue [Line Items]
Revenue		386,006	369,758	1,127,276	1,093,753
BCO Independent Contractor Truck and Brokerage Carriers Truck | Less than Truckload
Disaggregation of Revenue [Line Items]
Revenue		24,480	24,195	72,229	77,902
BCO Independent Contractor Truck and Brokerage Carriers Truck | Other Truck Transportation
Disaggregation of Revenue [Line Items]
Revenue	[1]	$ 96,041	$ 93,178	$ 288,807	$ 242,853
[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.

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