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Solar Energy Systems, Net - Components of Solar Energy Systems, Net (Detail) - Solar Energy Systems [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Solar energy systems in service	$ 6,587,439	$ 6,430,729
Initial direct costs related to customer solar energy system lease acquisition costs	101,197	99,380
Solar energy systems, gross	6,688,636	6,530,109
Less: accumulated depreciation and amortization	(608,006)	(495,518)
Solar energy systems, gross, less accumulated depreciation and amortization	6,080,630	6,034,591
Solar energy systems under construction	49,777	67,773
Solar energy systems pending interconnection	70,297	169,032
Solar energy systems, net	$ 6,200,704	$ 6,271,396