v3.26.3
Information Regarding Reportable Business Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2026
Sep. 27, 2025
Sep. 26, 2026
Sep. 27, 2025
Dec. 27, 2025
Segment Reporting Information [Line Items]          
Revenue $ 1,511,787 $ 1,205,406 $ 4,115,342 $ 3,569,291  
Gross revenue 1,523,217 1,216,423 4,178,395 3,633,401  
Investment income 2,264 3,293 7,943 10,620  
Purchased transportation 1,182,045 936,472 3,212,442 2,775,761  
Commissions to agents 117,676 98,693 319,254 291,529  
Other operating costs, net of gains on asset sales/dispositions 21,226 15,572 53,971 46,996  
Insurance and claims 66,700 44,025 193,246 167,419  
Selling, general and administrative 62,376 57,015 191,534 174,303  
Depreciation and amortization 9,918 11,509 30,887 35,884  
Impairment of intangible and other assets 0 30,104 0 30,104  
Operating income (loss) 65,540 26,326 185,004 122,025  
Goodwill 34,005 34,005 34,005 34,005 $ 34,005
Interest and debt expense (income) [1] 362 217 1,692 756  
Income before income taxes 65,178 26,109 183,312 121,269  
Related Party [Member]          
Segment Reporting Information [Line Items]          
Revenue 11,430 11,017 63,053 64,110  
Transportation Logistics          
Segment Reporting Information [Line Items]          
Revenue 1,497,058 1,190,802 4,071,824 3,525,234  
Gross revenue 1,497,058 1,190,802 4,071,824 3,525,234  
Purchased transportation 1,182,045 936,472 3,212,442 2,775,761  
Commissions to agents 117,676 98,693 319,254 291,529  
Other operating costs, net of gains on asset sales/dispositions 21,226 15,572 53,971 46,996  
Insurance and claims 32,582 26,014 94,043 89,387  
Selling, general and administrative 59,047 53,875 181,789 165,860  
Depreciation and amortization 9,918 11,509 30,887 35,884  
Impairment of intangible and other assets   30,104   30,104  
Operating income (loss) 74,564 18,563 179,438 89,713  
Goodwill 34,005 34,005 34,005 34,005  
Insurance          
Segment Reporting Information [Line Items]          
Revenue 14,729 14,604 43,518 44,057  
Gross revenue 26,159 25,621 106,571 108,167  
Investment income 2,264 3,293 7,943 10,620  
Insurance and claims 34,118 18,011 99,203 78,032  
Selling, general and administrative 3,329 3,140 9,745 8,443  
Operating income (loss) (9,024) 7,763 5,566 32,312  
Insurance | Related Party [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 11,430 $ 11,017 $ 63,053 $ 64,110  
[1] Interest and debt expense includes (i) interest income earned on cash balances held by the transportation logistics segment of $2,088 and $3,549 in the 2026 and 2025 thirty-nine-week periods, respectively, and $837 and $1,140 in the 2026 and 2025 thirteen-week periods, respectively, and (ii) consolidated total interest expense of $3,780 and $4,305 in the 2026 and 2025 thirty-nine-week periods, respectively, and $1,199 and $1,357 in the 2026 and 2025 thirteen-week periods, respectively.