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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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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Cash received on stock transaction after deduction of issuance costs.

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No definition available.

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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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Summary of Significant Accounting Policies - Liquidity (Details) - USD ($)					5 Months Ended	9 Months Ended
	Sep. 21, 2018	Apr. 30, 2018	Dec. 05, 2017	May 03, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Nov. 02, 2018
Debt Instrument [Line Items]
Stock sold during period, net proceeds					$ 205,925,000
Proceeds from issuance of senior unsecured notes						$ 350,000,000	$ 0
Line of Credit \| Floor Plan Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity						$ 600,000
Line of Credit \| Floor Plan Facility \| Subsequent Event
Debt Instrument [Line Items]
Line of credit, additional borrowing capacity								$ 300,000,000.0
Senior Notes \| Senior Unsecured Notes Effective September 2018
Debt Instrument [Line Items]
Proceeds from issuance of senior unsecured notes	$ 342,500,000
Class A
Debt Instrument [Line Items]
Sale of stock, net proceeds received		$ 172,300,000
Class A \| IPO
Debt Instrument [Line Items]
Sale of stock, net proceeds received				$ 205,800,000
Stock sold during period, net proceeds				$ 205,800,000
Class A Convertible Preferred Stock
Debt Instrument [Line Items]
Stock sold during period, net proceeds			$ 98,500,000