Lease Agreements and Power Purchase Agreements - Additional Information (Details)	9 Months Ended
	Aug. 31, 2016 Lease
Operating Leased Assets [Line Items]
Estimated residual value over the lease term	20 years
Lease term expiration date	Dec. 31, 2019
Residential Portfolio
Operating Leased Assets [Line Items]
Number of operating lease agreements	5,900