Stockholders' Equity - Follow-On Public Offering (Details) - USD ($)		6 Months Ended
	Apr. 30, 2018	Jun. 30, 2018	May 03, 2017
Class A | Follow-On Offering
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	6,600,000
Sale of stock, price per share (in dollars per share)	$ 27.50
Sale of stock, net proceeds received	$ 172,300,000
Class A | Follow-On Public Offering - Shares from Selling Stockholder And Selling LLC Unitholders
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	6,100,000
Sale of stock, net proceeds received	$ 0
Carvana Group | Class A Common Units
Subsidiary, Sale of Stock [Line Items]
Investment owned, balance (in shares)	8,300,000		18,800,000
Exchange Agreement
Subsidiary, Sale of Stock [Line Items]
Conversion of stock, converted (in shares)	6,900,000	12,000,000.0
Exchange Agreement | Class A
Subsidiary, Sale of Stock [Line Items]
Conversion of stock, issued (in shares)	5,600,000	9,600,000