Non-controlling Interests - Changes in Ownership (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Transfers (to) from non-controlling interests:
Increase as a result of exchanges of LLC Units	$ 13,203	$ 0
Increase as a result of adjustments to non-controlling interests	0	333
Total transfers to non-controlling interest	(169,164)	(173,922)
Car360
Transfers (to) from non-controlling interests:
Increase as a result of Carvana Group's issuance of Class A Units in connection with business acquisitions	1,297	0
Class A
Transfers (to) from non-controlling interests:
Decrease as a result of issuances of Class A common stock	(132,375)	(174,255)
Class A Convertible Preferred Stock
Transfers (to) from non-controlling interests:
Decrease as a result of Conversion of Class A Convertible Preferred Stock	$ (51,289)	$ 0