Description of Business - Summary of Assets Comprise the Portfolio (Details)	6 Months Ended
	May 31, 2017 Lease MW	Feb. 24, 2017 MW	Nov. 30, 2016 MW	Sep. 09, 2016 MW	Jan. 26, 2016 MW
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	945
Maryland Solar | Maryland | FirstEnergy Solutions
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	20
Remaining term of offtake agreement (in years)	15 years 9 months 18 days
Solar Gen 2 | California | San Diego Gas & Electric
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	150
Remaining term of offtake agreement (in years)	22 years 6 months
Lost Hills Blackwell | California | City of Roseville/Pacific Gas and Electric
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	32
Remaining term of offtake agreement (in years)	26 years 7 months 6 days
Lost Hills Blackwell | California | Pacific Gas and Electric
Description Of Business And Basis Of Presentation [Line Items]
Remaining term of offtake agreement (in years)	25 years
Lost Hills Blackwell | California | City Of Roseville
Description Of Business And Basis Of Presentation [Line Items]
Remaining term of offtake agreement (in years)	1 year 7 months 6 days
North Star | California | Pacific Gas and Electric
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	60
Remaining term of offtake agreement (in years)	18 years 1 month 6 days
RPU | California | City of Riverside
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	7
Remaining term of offtake agreement (in years)	23 years 3 months 18 days
Quinto | California | Southern California Edison
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	108
Remaining term of offtake agreement (in years)	18 years 6 months
Hooper | Colorado | Public Service Company of Colorado
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	50
Remaining term of offtake agreement (in years)	18 years 7 months 6 days
Kingbird | California | Southern California Public Power Authority
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	40
Remaining term of offtake agreement (in years)	18 years 10 months 24 days
Henrietta | California | Pacific Gas and Electric
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	102
Remaining term of offtake agreement (in years)	19 years 3 months 18 days
Stateline | California | Southern California Edison
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	300
Remaining term of offtake agreement (in years)	19 years 3 months 18 days
UC Davis | California | University of California
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	13
Remaining term of offtake agreement (in years)	18 years 3 months 18 days
Macy's California | California | Macy's Corporate Services
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	3
Remaining term of offtake agreement (in years)	18 years 4 months 24 days
Macy’s Maryland | Maryland | Macy's Corporate Services
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	5
Remaining term of offtake agreement (in years)	19 years 6 months
Kern | California | Kern High School District
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	16
Remaining term of offtake agreement (in years)	19 years 7 months 6 days
Residential Portfolio
Description Of Business And Basis Of Presentation [Line Items]
Number of solar installations | Lease	5,800
Residential Portfolio | U.S. – Various
Description Of Business And Basis Of Presentation [Line Items]
Number of solar installations | Lease	5,800
Residential Portfolio | U.S. – Various | Homeowners
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)	39
Remaining term of offtake agreement (in years)	15 years 3 months 18 days
OpCo | Kern | California
Description Of Business And Basis Of Presentation [Line Items]
MW(ac)		3	5	5	3