Lease Pass-Through Financing Obligations - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Property Subject To Or Available For Operating Lease [Line Items]
Initial lease term	20 years
Solar energy systems, gross	$ 1,807,643	$ 1,566,667
Depreciation on lease	176,161	143,028
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Solar energy systems, gross	394,800	322,200
Depreciation on lease	$ 26,100	$ 19,300
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member] | Minimum
Property Subject To Or Available For Operating Lease [Line Items]
Initial lease term	20 years
Solar Energy Systems Under Lease Pass-through Fund Arrangements [Member] | Maximum
Property Subject To Or Available For Operating Lease [Line Items]
Initial lease term	25 years