Solar Energy Systems (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Subject To Or Available For Operating Lease [Line Items]
Solar energy systems, gross	$ 1,500,286	$ 1,064,169
Less: Accumulated depreciation and amortization	(73,793)	(32,505)
Solar energy systems, net excluding inventory	1,426,493	1,031,664
Solar energy system inventory	31,862	70,493
Solar energy systems, net	1,458,355	1,102,157
System Equipment Costs
Property Subject To Or Available For Operating Lease [Line Items]
Solar energy systems, gross	1,238,968	893,088
Initial Direct Costs Related to Solar Energy Systems
Property Subject To Or Available For Operating Lease [Line Items]
Solar energy systems, gross	$ 261,318	$ 171,081