Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 46,821	$ 24,924	$ 8,523
Property and equipment
Property Plant And Equipment [Line Items]
Depreciation and amortization	11,100	8,200	3,400
Vehicles Acquired Under Capital Leases | Solar Energy Systems
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 5,500	$ 5,500	$ 3,000