Vehicle Floorplan Facilities - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Line Of Credit Facility [Line Items]
Cash deposits included in restricted cash		$ 196,809,000		$ 82,450,000
2020 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Outstanding borrowings		569,900,000		$ 512,800,000
Interest expense		$ 7,000,000.0	$ 3,800,000
Weighted average interest rate		4.30%		4.30%
Debt instrument, covenant compliance		As of March 31, 2022 and December 31, 2021, the Company was in compliance with all covenants related to the 2020 Vehicle Floorplan Facility.
2020 Vehicle Floorplan Facility | Cash Deposits
Line Of Credit Facility [Line Items]
Cash deposits included in restricted cash		$ 56,400,000		$ 50,600,000
Vehicle Floorplan Facilities | Credit Balance Agreements
Line Of Credit Facility [Line Items]
Interest credits earned		$ 3,900,000	$ 2,200,000
Ally Bank and Ally Financial | Line Of Credit | 2020 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 700,000.0
Line of credit facility, description		The amount of credit available is determined on a monthly basis based on a calculation that considers average outstanding borrowings and vehicle units paid off by the Company within the immediately preceding three-month period. As of March 31, 2022, the borrowing capacity of the 2020 Vehicle Floorplan Facility was $700.0 million, of which $130.1 million was unutilized.
Line of credit facility, current borrowing capacity		$ 700,000,000.0
Line of credit facility, unutilized borrowing capacity		$ 130,100,000
Debt instrument, covenant description		The 2020 Vehicle Floorplan Facility is collateralized by the Company’s vehicle inventory and certain other assets and the Company is subject to covenants that require it to maintain a certain level of equity in the vehicles that are financed, to maintain at least 7.5% of the outstanding borrowings in cash and cash equivalents, and to maintain 10% of the daily floorplan principal balance outstanding on deposit with Ally Bank.
Debt instrument covenant to maintain minimum percentage of outstanding borrowings in cash and cash equivalents		7.50%
Maturity Date	Mar. 31, 2023
Availability fee payable each quarter on average unused capacity from prior quarter floorplan allowance percentage		50.00%
Debt instrument covenant to maintain principal balance outstanding		10.00%
Ally Bank and Ally Financial | Line Of Credit | 2020 Vehicle Floorplan Facility | Prime Rate
Line Of Credit Facility [Line Items]
Basis points		1.05%