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Segment Information - Schedule of Financial Information with Respect to our Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenue from operations $ 1,406,511 $ 1,470,211 $ 4,189,093 $ 4,428,981
Less significant expenses:        
Salaries and wages 474,473 491,656 1,432,376 1,483,028
Employee benefit costs 188,561 189,582 560,836 550,384
Operating supplies and expenses 144,185 156,177 436,534 489,669
General supplies and expenses 45,075 46,040 126,631 135,987
Operating taxes and licenses 34,582 36,733 105,168 108,853
Insurance and claims 18,803 17,209 55,077 52,544
Communications and utilities 9,568 10,056 29,667 31,209
Depreciation and amortization 92,219 86,666 272,014 255,760
Purchased transportation 28,274 30,941 84,481 93,661
Miscellaneous expenses, net 9,927 3,290 29,515 17,908
Total non-operating expense (income) 543 (1,233) 633 (12,444)
Provision for income taxes 89,354 94,514 261,928 299,493
Net income $ 270,947 $ 308,580 $ 794,233 $ 922,929