Related Party Transactions - Components of Related Party Transactions (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Cost of revenue—operating leases and incentives		$ 150,796	$ 131,213	$ 67,984
Sales and marketing		41,436	48,078	21,869
General and administrative		81,802	92,664	78,899
Interest expense		34,008	12,568	9,323
Related Party
Related Party Transaction [Line Items]
Cost of revenue—operating leases and incentives		3,311	6,054	7,834
Sales and marketing		2,610	2,133	2,312
General and administrative		$ 749	$ 5,241	5,909
Interest expense	[1]			$ 4,481

[1] Includes revolving lines of credit—related party. See Note 11—Debt Obligations.