Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt - Additional Information (Detail)

v3.4.0.3
Nonrecourse Debt - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Nonrecourse Asset-Backed Debt, Aggregate Principal Amount $ 551,691,000 $ 563,189,000
Ineffectiveness recorded on designated hedges 0 0
Financing receivables securing debt, carrying value 91,000,000 97,000,000
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Debt Instrument [Line Items]    
Interest Expense 0 0
Nonrecourse Asset-Backed Debt Agreement [Member] | HASI Sustainable Yield Bond 2015-1A ("HASI SYB") [Member]    
Debt Instrument [Line Items]    
Nonrecourse Asset-Backed Debt, Aggregate Principal Amount $ 101,000,000  
Nonrecourse Asset-Backed Debt, Interest Rate 4.28%  
Nonrecourse Asset-Backed Debt, Maturity Date 2034-10  
Nonrecourse Asset-Backed Debt Agreement [Member] | HASI Sustainable Yield Bond 2015-1B [Member]    
Debt Instrument [Line Items]    
Nonrecourse Asset-Backed Debt, Aggregate Principal Amount $ 18,000,000  
Nonrecourse Asset-Backed Debt, Interest Rate 5.00%  
Nonrecourse Asset-Backed Debt, Maturity Date 2034-10  
Other Nonrecourse Debt [Member]    
Debt Instrument [Line Items]    
Financing receivables securing debt, carrying value $ 91,000,000 $ 97,000,000