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Indebtedness - Additional Information (Details) - USD ($)
1 Months Ended 6 Months Ended
Mar. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2016
Jun. 30, 2015
May 31, 2016
Dec. 31, 2015
Apr. 30, 2015
Debt Instrument [Line Items]                    
Loan outstanding balance           $ 754,686,000     $ 534,764,000  
Solar energy systems, gross           2,459,367,000     2,091,585,000  
Repayment of lease obligations           6,416,000 $ 1,472,000      
Bank Line of Credit | Syndicated Working Capital Facility                    
Debt Instrument [Line Items]                    
Line of credit, maximum borrowing capacity           245,000,000       $ 205,000,000
Line of credit facility capacity, period increase           40,000,000        
Minimum unencumbered liquid assets to be maintained           $ 25,000,000        
Bank Line of Credit | Syndicated Working Capital Facility | Minimum                    
Debt Instrument [Line Items]                    
Interest coverage ratio           200.00%        
Syndicated Term Loans                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   $ 250,000,000                
Debt maturity date   Dec. 31, 2020                
Syndicated Term Loans | Line Of Credit Facility                    
Debt Instrument [Line Items]                    
Line of credit facility capacity, period increase               $ 90,000,000    
Maximum borrowing capacity   $ 220,000,000           $ 310,000,000    
Syndicated Term Loans | Term Loan                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   23,000,000                
Syndicated Term Loans | Letter of Credit                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity   $ 7,000,000                
Syndicated Term Loans | Basis point | Line Of Credit Facility                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate   2.50%                
Revolving line of credit facility available period   3 years                
Debt instrument, variable rate periodic increase   2.75%                
Revolving line of credit facility available period increase   2 years                
Syndicated Term Loans | Basis point | Term Loan                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate   5.00%                
Revolving line of credit facility available period   3 years                
Debt instrument, variable rate periodic increase   6.50%                
Revolving line of credit facility available period increase   2 years                
Syndicated Term Loans | LIBOR Floor Rate | Term Loan                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate   1.00%                
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 195,400,000            
Debt maturity date           Dec. 31, 2021        
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Subordinated Term Loan                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       24,000,000            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Working Capital Revolver Commitment                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       5,000,000            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Senior Secured Revolving Letter Of Credit Facility                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 7,900,000            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Basis point | Senior Term Loan                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate       2.75%            
Debt instrument, variable rate periodic increase       0.25%            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Minimum | Subordinated Term Loan                    
Debt Instrument [Line Items]                    
Debt prepayment penalty percentage       0.00%            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Minimum | Basis point | Subordinated Term Loan                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate       1.00%            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Maximum | Subordinated Term Loan                    
Debt Instrument [Line Items]                    
Debt prepayment penalty percentage       2.00%            
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Maximum | Basis point | Subordinated Term Loan                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate       5.00%            
Syndicated Term Loans | Aggregation Facility | Senior Term Loan                    
Debt Instrument [Line Items]                    
Maximum borrowing capacity       $ 158,500,000            
Secured, Non-recourse Loan Agreement                    
Debt Instrument [Line Items]                    
Aggregate amount of debt $ 24,500,000                  
Debt instrument maturity year 2022-09                  
Debt instrument, Description           In March 2016, a subsidiary of the Company entered into a $24.5 million secured, non-recourse loan agreement with a bank. The loan will be repaid through cashflows from a lease pass-through arrangement previously entered into by the Company. The loan matures in September 2022 and has an interest rate of LIBOR + 2.25%.        
Secured, Non-recourse Loan Agreement | Basis point                    
Debt Instrument [Line Items]                    
Annual Contractual Interest Rate 2.25%                  
Bank Term Loans                    
Debt Instrument [Line Items]                    
Debt maturity date           Apr. 30, 2022        
Aggregate amount of debt         $ 38,000,000          
Interest Rate         4.50%          
Notes Payable                    
Debt Instrument [Line Items]                    
Debt maturity date           Dec. 31, 2018        
Proceeds from issuance of senior secured notes         $ 27,200,000          
Notes Payable | Payment in Kind ("PIK")                    
Debt Instrument [Line Items]                    
Interest Rate         12.00%          
Loan outstanding balance           $ 8,200,000     6,300,000  
Solar Asset Backed Securities Class A                    
Debt Instrument [Line Items]                    
Aggregate amount of debt     $ 100,000,000              
Solar Asset Backed Securities Class B                    
Debt Instrument [Line Items]                    
Aggregate amount of debt     11,000,000              
Asset Backed Securities                    
Debt Instrument [Line Items]                    
Secured Borrowings Assets Carrying Amount           $ 186,100,000     $ 190,200,000  
Debt instrument discount rate           0.08%        
Solar energy systems, gross           $ 119,700,000        
Repayment of lease obligations     $ 88,900,000     88,900,000        
Net of fees from proceeds from debt instrument           $ 7,300,000