Acquisitions and Investments - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended		9 Months Ended
	Sep. 30, 2024	Jul. 30, 2024	Dec. 31, 2023	Jul. 01, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jul. 17, 2024
Business Acquisition [Line Items]
Total revenue					$ 1,876,676	$ 2,019,936	$ 5,545,797	$ 5,209,847
Net income					30,059	59,897	46,959	226,514
Amortization of Intangible Assets					18,922	18,907	56,009	51,595
Equity Method Investment, Realized Gain (Loss) on Disposal					(12,100)		(12,100)
U.S. Xpress
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Jul. 30, 2024		Jul. 01, 2023
Total revenue					409,600		1,200,000
Net income					10,100		29,400
Amortization of Intangible Assets					$ 2,300		$ 6,900
Business Combination, Acquisition Related Costs						$ 6,500		$ 31,800
Fair value of the consideration transferred	$ 632,109		$ 632,109
Eleos
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									18.50%
DHE
Business Acquisition [Line Items]
Fair value of the consideration transferred	$ 184,986	$ 185,000
DHE | Escrow For Sellers
Business Acquisition [Line Items]
Fair value of the consideration transferred		$ 1,500