Indebtedness - Schedule of Debt - Additional Details (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Recourse debt | Bank line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	3.25%	3.25%
Recourse debt | Bank line of credit | Base Rate
Debt Instrument [Line Items]
Annual contractual interest rate	2.25%	2.25%
Recourse debt | Bank line of credit | Federal Funds Rate
Debt Instrument [Line Items]
Annual contractual interest rate	0.50%	0.50%
Recourse debt | Bank line of credit | Prime Rate
Debt Instrument [Line Items]
Annual contractual interest rate	1.00%	1.00%
Non recourse debt | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Annual contractual interest rate	2.50%	2.50%
Debt instrument, variable rate periodic increase	2.75%	2.75%
Revolving line of credit facility available period	3 years	3 years
Revolving line of credit facility available period increase	2 years	2 years
Non recourse debt | Term loan due April 2024 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Revolving line of credit facility available period increase	4 years	4 years
Non recourse debt | Term loan due April 2024 | Base Rate
Debt Instrument [Line Items]
Debt instrument, variable rate periodic increase	1.75%	1.75%
Non recourse debt | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Debt instrument, variable rate periodic increase	6.50%	6.50%
Revolving line of credit facility available period increase	3 years	3 years
Non recourse debt | Term Loan B | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Non recourse debt | Term Loan A | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Debt instrument, variable rate periodic increase	3.00%	3.00%
Contracted SRECs | Non recourse debt | Bank term loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.50%	5.50%
Uncontracted SRECs | Non recourse debt | Bank term loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	9.00%	9.00%