Acquisitions (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Aug. 31, 2022	May 31, 2022	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Business Combinations [Abstract]
Business Combination, Accounts and Other Receivables, Net, Current	$ 74,740	$ 32,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	13,054	6,238
Business Combination, Property, Plant, and Equipment, Net	461,147	68,196
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Operating Lease right of use of assets		26,661
Business Combination, Other Assets, Noncurrent	306	4,079
Business Combination, Deferred Income Taxes Asset	2,018
Business Combination, Intangible Assets, Current	55,097	29,902
Business Combination, Goodwill, Acquired During Period	112,083	40,297
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	718,445	207,673
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	(47,819)	(7,917)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Insurance	(1,621)	(4,263)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt		(11,424)
Business Combination, Finance Lease, Liability		(35,359)
Operating lease liabilities		(26,661)
Business Combination Income Taxes Payable	(765)
Business Combination, Deferred Income Taxes, Liability	(116,506)
Purchase consideration net of cash on hand	551,734
Purchase adjustment receivable from seller	2,069
Business Combination, Payments to Acquire Businesses, Net	553,803	122,049
Business Acquisition, Consideration Transferred and debt assumed		169,400
Business Combination, Gross Cash Paid	560,600	140,600
Adjusted purchase price	558,600
Business Combination, Cash Acquired	6,800	18,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt and finance lease liability		$ (46,800)	$ (40,300)	$ (40,300)
Acquired Business Percent of Assets, Smith Transport			12.30%	12.30%
Acquired Business Percent of Assets, CFI			43.00%	43.00%
Acquired Business Percent of Revenue, Smith Transport				13.30%
Acquired Business Percent of Revenue, CFI				21.60%
Business Combination, Acquisition Related Costs				$ 2,300
Business Acquisition, Pro Forma Revenue, Smith Transport				1,060,718	$ 810,459
Business Acquisition, Pro Forma Revenue, CFI				1,394,552	1,152,412
Business Acquisition, Pro Forma Net Income (Loss), Smith Transport				140,647	96,466
Business Acquisition, Pro Forma Net Income (Loss), CFI				174,684	$ 83,219
Goodwill, Acquired During Period, CFI			$ 5,700	112,083
Goodwill, Acquired During Period, Smith Transport			$ (1,800)	$ 40,297
Net adjustment to purchase price	$ 2,000