Solar Energy Systems, Leased and To Be Leased - Net - Components of Solar Energy Systems, Leased and to Be Leased (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Leases [Abstract]
Solar energy systems leased to customers	$ 3,619,214	$ 2,388,548
Initial direct costs related to customer solar energy system lease acquisition costs	383,506	207,537
Solar energy systems, leased and to be leased, gross	4,002,720	2,596,085
Less accumulated depreciation and amortization	(275,158)	(159,160)
Solar energy systems, leased and to be leased gross, less accumulated depreciation and amortization	3,727,562	2,436,925
Solar energy systems under construction	358,010	131,048
Solar energy systems to be leased to customers	289,981	228,823
Solar energy systems, leased and to be leased - net	$ 4,375,553	$ 2,796,796