Operating Property (Detail) - USD ($) $ in Thousands	Dec. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Land	$ 16,328	$ 16,328
Buildings and improvements	71,157	69,160
Trailing equipment	491,208	502,322
Information technology hardware and software	132,153	110,626
Other equipment	10,136	9,828
Total operating property, gross	720,982	708,264
Less accumulated depreciation and amortization	436,682	393,274
Total operating property, net	$ 284,300	$ 314,990