Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Interest earned on deposits in United States money market accounts and other United States interest earning accounts.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Description of the terms of a credit facility arrangement. Terms typically include interest rate, collateral required, guarantees required, repayment requirements, and restrictions on use of assets and activities of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Debt instrument covenant percentage of deposit in basis of monthly credit line availability.

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No definition available.

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Debt instrument covenant to maintain minimum percentage of outstanding borrowings in cash and cash equivalents.

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No definition available.

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Line of credit facility expiration, year and month.

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Period of LIBOR measurement.

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Vehicle Floorplan Facilities - Additional Information (Details) - 2020 Vehicle Floorplan Facility - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Line Of Credit Facility [Line Items]
Outstanding borrowings		$ 363,600,000		$ 363,600,000		$ 329,200,000
Interest expense		$ 3,600,000	$ 1,000,000.0	$ 7,400,000	$ 3,700,000
Weighted average interest rate		4.35%		4.35%		4.39%
Debt instrument, covenant compliance				As of June 30, 2021 and December 31, 2020, the Company was in compliance with all covenants related to the 2020 Vehicle Floorplan Facility.
Credit Balance Agreements
Line Of Credit Facility [Line Items]
Interest credits earned		$ 2,000,000.0	$ 700,000	$ 4,200,000	$ 2,400,000
Ally Bank and Ally Financial \| Line Of Credit
Line Of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 450,000,000.0
Expiration term	2022-09
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.
Line of credit facility, current borrowing capacity		450,000,000.0		$ 450,000,000.0
Line of credit facility, unutilized borrowing capacity		$ 86,400,000		$ 86,400,000
Period of LIBOR measurement	1 month
Basis points	4.25%
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%
Debt instrument covenant percentage of deposit in basis of monthly credit line availability	10.00%