v3.26.1
Information Regarding Reportable Business Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2026
Jun. 28, 2025
Jun. 27, 2026
Jun. 28, 2025
Dec. 27, 2025
Segment Reporting Information [Line Items]          
Revenue $ 1,432,264 $ 1,211,383 $ 2,603,555 $ 2,363,885  
Gross revenue 1,472,593 1,252,897 2,655,178 2,416,978  
Investment income 2,705 3,729 5,679 7,327  
Purchased transportation 1,123,400 941,411 2,030,397 1,839,289  
Commissions to agents 109,435 99,522 201,578 192,836  
Other operating costs, net of gains on asset sales/dispositions 17,945 19,595 32,745 31,424  
Insurance and claims 79,688 71,963 126,546 123,394  
Selling, general and administrative 68,193 55,706 129,158 117,288  
Depreciation and amortization 10,409 12,149 20,969 24,375  
Operating income 66,228 56,280 119,464 95,699  
Goodwill 34,005 41,399 34,005 41,399 $ 34,005
Interest and debt expense (income) [1] 812 698 1,330 539  
Income before income taxes 65,416 55,582 118,134 95,160  
Related Party [Member]          
Segment Reporting Information [Line Items]          
Revenue 40,329 41,514 51,623 53,093  
Transportation Logistics          
Segment Reporting Information [Line Items]          
Revenue 1,417,765 1,196,687 2,574,766 2,334,432  
Gross revenue 1,417,765 1,196,687 2,574,766 2,334,432  
Purchased transportation 1,123,400 941,411 2,030,397 1,839,289  
Commissions to agents 109,435 99,522 201,578 192,836  
Other operating costs, net of gains on asset sales/dispositions 17,945 19,595 32,745 31,424  
Insurance and claims 30,835 29,517 61,461 63,373  
Selling, general and administrative 64,956 52,559 122,742 111,985  
Depreciation and amortization 10,409 12,149 20,969 24,375  
Operating income 60,785 41,934 104,874 71,150  
Goodwill 34,005 41,399 34,005 41,399  
Insurance          
Segment Reporting Information [Line Items]          
Revenue 14,499 14,696 28,789 29,453  
Gross revenue 54,828 56,210 80,412 82,546  
Investment income 2,705 3,729 5,679 7,327  
Insurance and claims 48,853 42,446 65,085 60,021  
Selling, general and administrative 3,237 3,147 6,416 5,303  
Operating income 5,443 14,346 14,590 24,549  
Insurance | Related Party [Member]          
Segment Reporting Information [Line Items]          
Revenue $ 40,329 $ 41,514 $ 51,623 $ 53,093  
[1] Interest and debt expense includes (i) interest income earned on cash balances held by the transportation logistics segment of $1,251 and $2,409 in the 2026 and 2025 twenty-six-week periods, respectively, and $473 and $741 in the 2026 and 2025 thirteen-week periods, respectively, and (ii) consolidated total interest expense of $2,581 and $2,948 in the 2026 and 2025 twenty-six-week periods, respectively, and $1,285 and $1,439 in the 2026 and 2025 thirteen-week periods, respectively.