Debt And Financing (Details) - USD ($) $ in Thousands						9 Months Ended
		Sep. 30, 2024	Aug. 06, 2024	Jun. 22, 2023	Sep. 03, 2021	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-Term Debt		$ 1,630,971				$ 1,630,971	$ 1,561,079
Less: current portion of long-term debt		(129,406)				(129,406)	(338,058)
Long-term debt – less current portion		1,501,565				1,501,565	1,223,021
Revolving line of credit		227,000				227,000	67,000
Long-term Debt		1,857,971				1,857,971	1,628,079
Letters of Credit Outstanding, Amount		248,000				248,000	264,300
2021 Term Loan A-2
Debt Instrument [Line Items]
Long-Term Debt	[1],[2]	349,021				349,021	199,902
Deferred loan costs		$ 1,000				1,000	100
Line of Credit Facility, Maximum Borrowing Capacity			$ 350,000		$ 200,000
Final maturity date					Sep. 03, 2026
Program fees on outstanding balances			SOFR + credit spread adjustment 10 basis points
Minimum principal payment — amount					$ 0
Minimum principal payment — frequency					Once
Minimum principal payment — commencement date			Sep. 03, 2026
Debt Instrument, Interest Rate During Period		6.46%
2021 Term Loan A-2 | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3]		0.88%
2021 Term Loan A-2 | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3]		1.50%
2021 Term Loan A-3
Debt Instrument [Line Items]
Long-Term Debt	[1],[2]	$ 789,323				789,323	799,058
Deferred loan costs		$ 700				700	900
Line of Credit Facility, Maximum Borrowing Capacity					$ 800,000
Final maturity date					Sep. 03, 2026
Program fees on outstanding balances			SOFR + credit spread adjustment 10 basis points
Minimum principal payment — amount					$ 10,000
Minimum principal payment — frequency					Quarterly
Minimum principal payment — commencement date					Sep. 30, 2024
Debt Instrument, Interest Rate During Period		6.46%
2021 Term Loan A-3 | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3]				0.88%
2021 Term Loan A-3 | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3]				1.50%
2023 Term Loan
Debt Instrument [Line Items]
Long-Term Debt	[2],[4]	$ 249,378				249,378	249,135
Deferred loan costs		$ 600				600	900
Line of Credit Facility, Maximum Borrowing Capacity				$ 250,000
Final maturity date				Sep. 03, 2026
Program fees on outstanding balances				SOFR
Debt Instrument, Interest Rate, Stated Percentage				1.75%
Minimum principal payment — amount				$ 0
Debt Instrument, Interest Rate During Period		6.71%
Debt Instrument, Basis Spread on Variable Rate				0.10%
2021 Prudential Notes
Debt Instrument [Line Items]
Long-Term Debt	[2]	$ 16,787				16,787	25,078
2021 Prudential Notes | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.05%
2021 Prudential Notes | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					4.40%
Other Debt
Debt Instrument [Line Items]
Secured Debt, Other		6,952				6,952	8,567
2021 Revolver
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$ 18,100				18,100	18,000
Line of Credit Facility, Maximum Borrowing Capacity	[5]				$ 1,100,000
Final maturity date	[5]				Sep. 03, 2026
Program fees on outstanding balances	[5]		SOFR + credit spread adjustment 10 basis points
Minimum principal payment — amount	[5]				$ 0
Minimum principal payment — frequency	[5]				Once
Minimum principal payment — commencement date	[5]				Sep. 03, 2026
Debt Instrument, Interest Rate During Period		6.46%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.20%
Line of Credit Facility, Commitment Fee Percentage		1.50%
2021 Revolver | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3],[5]				0.88%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage					0.10%
2021 Revolver | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[3],[5]				1.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage					0.20%
U.S. Xpress Revenue Equipment Installment Notes
Debt Instrument [Line Items]
Secured Debt	[2],[6]	$ 219,510				$ 219,510	$ 279,339
Debt, Weighted Average Interest Rate		4.80%				4.80%	4.70%
Debt Instrument, Collateral Amount		$ 190,200				$ 190,200
U.S. Xpress Revenue Equipment Installment Notes | Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period		2.00%
Debt Instrument, Term						48 months
U.S. Xpress Revenue Equipment Installment Notes | Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period		7.20%
Debt Instrument, Term						84 months
Line of Credit | 2021 Revolver
Debt Instrument [Line Items]
Revolving line of credit	[2],[7]	$ 227,000				$ 227,000	$ 67,000
Loans Payable [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 2,300,000
Loans Payable [Member] | 2021 Term Loan A-2
Debt Instrument [Line Items]
Deferred loan costs		1,000				1,000	100
Loans Payable [Member] | 2021 Term Loan A-3
Debt Instrument [Line Items]
Deferred loan costs		700				700	900
Loans Payable [Member] | 2023 Term Loan
Debt Instrument [Line Items]
Deferred loan costs		$ 600				$ 600	$ 900
Loans Payable [Member] | 2021 Prudential Notes
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 125,000

[1] As of September 30, 2024, the carrying amounts of the 2021 Term Loan A-2 and 2021 Term Loan A-3 were net of $1.0 million and $0.7 million in deferred loan costs, respectively. As of December 31, 2023, the carrying amounts of the 2021 Term Loan A-2 and 2021 Term Loan A-3 were net of $0.1 million and $0.9 million in deferred loan costs, respectively.

[2] Refer to Note 12 for information regarding the fair value of debt.

[3] The interest rate margin for the 2021 Term Loans and 2021 Revolver is based on the Company's consolidated leverage ratio. As of September 30, 2024, interest accrued at 6.46% on the 2021 Term Loan A-2, 6.46% on the 2021 Term Loan A-3, and 6.46% on the 2021 Revolver.

[4] As of September 30, 2024, the carrying amount of the 2023 Term Loan was net of $0.6 million in deferred loan costs. As of December 31, 2023, the carrying amounts of the 2023 Term Loan was net of $0.9 million in deferred loan costs.

[5] The commitment fee for the unused portion of the 2021 Revolver is based on the Company's consolidated leverage ratio, and ranges from 0.1% to 0.2%. As of September 30, 2024, commitment fees on the unused portion of the 2021 Revolver accrued at 0.2% and outstanding letter of credit fees accrued at 1.5%.

[6] The revenue equipment installment loans were assumed at the close of the U.S. Xpress Acquisition and have a weighted average interest rate of 4.8% and 4.7% as of September 30, 2024 and December 31, 2023, respectively.

[7] The Company also had outstanding letters of credit of $18.1 million and $18.0 million under the 2021 Revolver, primarily related to workers' compensation and self-insurance liabilities for both September 30, 2024 and December 31, 2023, respectively. The Company also had outstanding letters of credit of $248.0 million and $264.3 million under a separate bilateral agreement which do not impact the availability of the 2021 Revolver as of September 30, 2024 and December 31, 2023, respectively.