Summary of Significant Accounting Policies and Procedures - Estimated Useful Lives of Respective Assets (Detail)	12 Months Ended
	Dec. 31, 2015
Minimum [Member]
Property Plant And Equipment [Line Items]
Initial direct costs related to customer solar energy system lease acquisition costs	10 years
Maximum [Member]
Property Plant And Equipment [Line Items]
Solar energy systems leased to customers	30 years
Initial direct costs related to customer solar energy system lease acquisition costs	20 years
Solar energy systems leased and to be leased [Member]
Property Plant And Equipment [Line Items]
Solar energy systems leased to customers	30 years