Acquisitions - Narrative (Details) - USD ($) $ in Thousands					3 Months Ended		6 Months Ended
	Jul. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Jul. 01, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jul. 17, 2024
Business Acquisition [Line Items]
Total revenue					$ 1,846,654	$ 1,552,979	$ 3,669,121	$ 3,189,911
Net income					19,893	62,904	16,900	166,617
Amortization of Intangible Assets					18,544	16,505	37,087	32,688
U.S. Xpress
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition				Jul. 01, 2023
Total revenue					405,600		819,000
Net income					(13,300)		(19,300)
Amortization of Intangible Assets					$ 2,300		$ 4,600
Business Combination, Acquisition Related Costs						$ 20,700		$ 25,300
Fair value of the consideration transferred		$ 632,109	$ 632,109
Eleos | Subsequent Event [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired									18.50%
DHE | Subsequent Event [Member]
Business Acquisition [Line Items]
Fair value of the consideration transferred	$ 185,000