Pass-Through Financing Obligations - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	20 years
Solar energy systems, gross	$ 4,219,907	$ 3,441,797
Depreciation on lease	$ 535,891	399,280
Discount on expected remaining lease payments	5.00%
Minimum
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	20 years
Maximum
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	25 years
Solar energy systems under lease pass-through fund arrangements
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	$ 664,100	464,200
Depreciation on lease	$ 82,100	$ 63,700
Solar energy systems under lease pass-through fund arrangements | Minimum
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	20 years