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Segment Reporting - Schedule of Financial and Operating Data by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Operating revenue $ 905,648 $ 986,495 $ 1,820,864 $ 1,985,988
Purchased transportation and warehousing 655,904 727,236 1,313,827 1,467,408
Salaries and benefits 143,310 141,856 292,723 286,352
Depreciation and amortization 32,387 37,772 64,966 76,103
Insurance and claims 10,644 12,639 21,526 25,257
General and administrative 28,925 27,877 56,070 55,111
(Gain) / loss on sale of assets, net 130 (413) 65 (910)
Total operating expenses 871,300 946,967 1,749,177 1,909,321
Operating income 34,348 39,528 71,687 76,667
ITS [Member]        
Segment Reporting Information [Line Items]        
Operating revenue 528,184 561,033 1,058,206 1,113,066
Purchased transportation and warehousing 364,048 397,129 727,962 785,334
Salaries and benefits 87,716 84,157 177,247 169,558
Depreciation and amortization 19,140 24,045 38,089 48,103
Insurance and claims 9,423 10,012 18,323 19,855
General and administrative 8,298 7,249 16,869 14,092
Corporate allocations 25,018 25,184 51,191 50,337
(Gain) / loss on sale of assets, net 134 (382) 68 (883)
Total operating expenses 513,777 547,394 1,029,749 1,086,396
Operating income 14,407 13,639 28,457 26,670
Logistics [Member]        
Segment Reporting Information [Line Items]        
Operating revenue 404,310 459,088 815,311 939,312
Purchased transportation and warehousing 318,409 363,424 637,929 747,850
Salaries and benefits 32,556 35,029 67,412 69,737
Depreciation and amortization 8,250 8,021 16,536 16,841
Insurance and claims 868 1,542 2,460 3,327
General and administrative 6,233 5,872 10,720 11,708
Corporate allocations 18,053 19,345 37,027 39,886
(Gain) / loss on sale of assets, net 0 (34) (3) (34)
Total operating expenses 384,369 433,199 772,081 889,315
Operating income 19,941 25,889 43,230 49,997
Eliminations [Member]        
Segment Reporting Information [Line Items]        
Operating revenue (26,846) (33,626) (52,653) (66,390)
Purchased transportation and warehousing (26,553) (33,292) (52,066) (65,722)
Salaries and benefits 0 0 0 0
Depreciation and amortization 0 0 0 0
Insurance and claims (293) (334) (587) (668)
General and administrative 0 0 0 0
Corporate allocations 0 0 0 0
(Gain) / loss on sale of assets, net 0 0 0 0
Total operating expenses (26,846) (33,626) (52,653) (66,390)
Operating income $ 0 $ 0 $ 0 $ 0