Debt and Financing - Additional Information (Details) - USD ($)					3 Months Ended		12 Months Ended
	Jan. 04, 2021	Jul. 07, 2020	Sep. 11, 2019	Jan. 31, 2018	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 09, 2020	Feb. 13, 2014
Debt Instrument [Line Items]
Draw of funds to acquire tractors and trailers										$ 140,600,000	$ 143,200,000	$ 145,400,000
Common stock shares, issued						50,192,000				50,192,000	33,715,000
Contribution rate of subsidiaries to funds											25.00%
Cash and cash equivalents						$ 439,300,000				$ 439,300,000	$ 109,200,000
Minimum | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage										0.25%
Maximum | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Commitment fee percentage										0.375%
2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Principal amount issued														$ 450,000,000
Basis spread on variable rate										2.25%
2014 ABL Facility Credit Agreement | Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate										1.25%
Term Loan
Debt Instrument [Line Items]
Principal amount issued			$ 600,000,000.0
Basis spread on variable rate			7.50%							14.00%
Margin step down if certain EBITDA is achieved			1.00%
Term Loan | Minimum
Debt Instrument [Line Items]
Adjusted EBITDA threshold for margin step down			$ 400,000,000.0
Term Loan | Eurodollar
Debt Instrument [Line Items]
Floor interest rate			1.00%
ABL Facility | Minimum | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Interest rate						2.25%				2.25%
UST Credit Agreement
Debt Instrument [Line Items]
Principal amount issued		$ 700,000,000.0
Debt instrument maturity date		Sep. 30, 2024
Common stock shares, issued						15,943,753				15,943,753			15,943,753
Fair value of common stock shares issued						$ 46,700,000				$ 46,700,000
Unamortized commitment fees						22,100,000				22,100,000
Residual unamortized balance						19,100,000				19,100,000
Unamortized debt issuance costs						5,800,000				5,800,000
Debt issuance costs, residual unamortized balance						$ 5,000,000.0				$ 5,000,000.0
Debt issuance costs incurred for origination and legal fees		$ 12,200,000
Expenses qualifying as adjustment cap, percent						10.00%				10.00%
Adjusted EBITDA expenses qualifying as adjustment cap, percent						10.00%				10.00%
UST Credit Agreement | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Increase in interest rate		0.50%
UST Credit Agreement | Forecast
Debt Instrument [Line Items]
Minimum adjusted EBITDA								$ 150,000,000.0	$ 100,000,000.0
Minimum adjusted EBITDA thereafter							$ 200,000,000.0
UST Credit Agreement | Tranche A
Debt Instrument [Line Items]
Principal amount issued		$ 300,000,000.0
Percentage of paid in kind remainder		1.50%
Proceeds from line of credit										$ 300,000,000.0
UST Credit Agreement | Tranche A | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
Floor interest rate		1.00%
UST Credit Agreement | Tranche B
Debt Instrument [Line Items]
Principal amount issued		$ 400,000,000.0
Proceeds from line of credit										74,800,000
UST Credit Agreement | Tranche B | Subsequent Event
Debt Instrument [Line Items]
Draw of funds to acquire tractors and trailers	$ 176,500,000
UST Credit Agreement | Tranche B | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate		3.50%
Floor interest rate		1.00%
UST Credit Agreement | 2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Line of credit facility borrowing capacity		$ 125,000,000.0
Second Term Loan Amendment
Debt Instrument [Line Items]
Minimum adjusted EBITDA						$ 125,000,000.0				125,000,000.0
Second Term Loan Amendment | Minimum
Debt Instrument [Line Items]
Minimum adjusted EBITDA										200,000,000.0
Second Term Loan Amendment | Forecast
Debt Instrument [Line Items]
Minimum adjusted EBITDA					$ 100,000,000.0			$ 150,000,000.0
Minimum adjusted EBITDA thereafter							$ 200,000,000.0
Second Term Loan Amendment | Forecast | Minimum
Debt Instrument [Line Items]
Minimum adjusted EBITDA									$ 100,000,000.0
Second Term Loan Amendment | Term Loan | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate		7.50%
Second Term Loan Amendment | Term Loan | Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		6.50%
Amended Second A&R CDA
Debt Instrument [Line Items]
Debt instrument maturity date				Dec. 31, 2022
Annual amortization of amount outstanding, percent				2.00%
2014 ABL Facility Credit Agreement
Debt Instrument [Line Items]
Cash and cash equivalents						439,300,000				439,300,000	109,200,000
Line of credit facility, total cash and availability											37,700,000
Managed accessibility						4,000,000.0				4,000,000.0	200,000
Cash, cash equivalents and managed accessibility						440,200,000				440,200,000	$ 80,400,000
2014 ABL Facility Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding, amount						353,300,000				$ 353,300,000
Collateral line cap, percent										10.00%
Restricted cash						3,100,000				$ 3,100,000
2014 ABL Facility Credit Agreement | ABL Facility
Debt Instrument [Line Items]
Line of credit facility, total cash and availability						$ 43,700,000				$ 43,700,000