Quarterly report pursuant to Section 13 or 15(d)

Indebtedness - Additional Information (Details)

v3.4.0.3
Indebtedness - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2016
Jan. 31, 2016
Jul. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Apr. 30, 2015
Line Of Credit Facility [Line Items]                  
Loan outstanding balance $ 632,787,000         $ 632,787,000   $ 534,764,000  
Solar energy systems, gross 2,271,242,000         2,271,242,000   2,091,585,000  
Repayment of lease obligations           3,115,000 $ 602,000    
Bank Line of Credit | Syndicated Working Capital Facility                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity                 $ 205,000,000
Minimum unencumbered liquid assets to be maintained $ 25,000,000         $ 25,000,000      
Bank Line of Credit | Syndicated Working Capital Facility | Minimum                  
Line Of Credit Facility [Line Items]                  
Interest coverage ratio 200.00%         200.00%      
Syndicated Term Loans                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 250,000,000              
Debt maturity date   Dec. 31, 2020              
Syndicated Term Loans | Aggregate Banking Facilities                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 220,000,000              
Syndicated Term Loans | Letter of Credit                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity   7,000,000              
Syndicated Term Loans | Term Loan                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity   $ 23,000,000              
Syndicated Term Loans | Term Loan | Basis point                  
Line Of Credit Facility [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 | Term Loan | LIBOR Floor Rate                  
Line Of Credit Facility [Line Items]                  
Annual Contractual Interest Rate   1.00%              
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 195,400,000          
Debt maturity date           Dec. 31, 2021      
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Senior Term Loan                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 158,500,000          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Senior Term Loan | Basis point                  
Line Of Credit Facility [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 | Subordinated Term Loan                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 24,000,000          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Working Capital Revolver Commitment                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity       5,000,000          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Senior Secured Revolving Letter Of Credit Facility                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity       $ 7,900,000          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Minimum | Subordinated Term Loan                  
Line Of Credit Facility [Line Items]                  
Debt prepayment penalty percentage       0.00%          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Minimum | Subordinated Term Loan | Basis point                  
Line Of Credit Facility [Line Items]                  
Annual Contractual Interest Rate       1.00%          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Maximum | Subordinated Term Loan                  
Line Of Credit Facility [Line Items]                  
Debt prepayment penalty percentage       2.00%          
Syndicated Term Loans | Credit Facility Agreements with Syndicate of Banks | Maximum | Subordinated Term Loan | Basis point                  
Line Of Credit Facility [Line Items]                  
Annual Contractual Interest Rate       5.00%          
Secured, Non-recourse Loan Agreement                  
Line Of Credit Facility [Line Items]                  
Aggregate amount of debt $ 24,500,000         $ 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                  
Line Of Credit Facility [Line Items]                  
Annual Contractual Interest Rate 2.25%                
Bank Term Loans                  
Line Of Credit Facility [Line Items]                  
Line of credit facility, maximum borrowing capacity         $ 38,000,000        
Notes Payable                  
Line Of Credit Facility [Line Items]                  
Proceeds from issuance of senior secured notes         $ 27,200,000        
Notes Payable | Payment in Kind ("PIK")                  
Line Of Credit Facility [Line Items]                  
Interest Rate         12.00%        
Loan outstanding balance $ 7,200,000         $ 7,200,000   6,300,000  
Solar Asset Backed Securities Class A                  
Line Of Credit Facility [Line Items]                  
Aggregate amount of debt     $ 100,000,000            
Solar Asset Backed Securities Class B                  
Line Of Credit Facility [Line Items]                  
Aggregate amount of debt     11,000,000            
Asset Backed Securities                  
Line Of Credit Facility [Line Items]                  
Secured Borrowings Assets Carrying Amount 188,000,000         $ 188,000,000   $ 190,200,000  
Debt instrument discount rate           0.08%      
Solar energy systems, gross $ 119,700,000         $ 119,700,000      
Repayment of lease obligations     $ 88,900,000     88,900,000      
Net of fees from proceeds from debt instrument           $ 7,300,000