Vehicle Floorplan Facility - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Line Of Credit Facility [Line Items]
Restricted cash		$ 153,741		$ 153,741		$ 82,450
2020 Vehicle Floorplan Facility
Line Of Credit Facility [Line Items]
Outstanding borrowings		422,500		422,500		$ 512,800
Interest expense		$ 6,300	$ 3,600	$ 13,300	$ 7,400
Weighted average interest rate		5.80%		5.80%		4.30%
Debt instrument, covenant compliance				As of June 30, 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]
Restricted cash		$ 42,200		$ 42,200		$ 50,600
Vehicle Floorplan Facility | Credit Balance Agreements
Line Of Credit Facility [Line Items]
Interest credits earned		3,600	$ 2,000	$ 7,500	$ 4,200
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
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 June 30, 2022, the borrowing capacity of the 2020 Vehicle Floorplan Facility was $700.0 million, of which $277.5 million was unutilized.
Line of credit facility, current borrowing capacity		700,000		$ 700,000
Line of credit facility, unutilized borrowing capacity		$ 277,500		$ 277,500
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 credit line 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 credit line 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%