Summary of Significant Accounting Policies - Liquidity (Details) - USD ($) $ in Millions	May 03, 2017	Mar. 31, 2017	Dec. 31, 2016
Floor Plan Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity		$ 10.3
Common Class A | IPO | Subsequent Event
Debt Instrument [Line Items]
Sale of stock, consideration received on transaction	$ 210.7
Carvana, LLC | Floor Plan Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity			$ 34.7