Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt - Additional Information (Detail)

v3.5.0.2
Nonrecourse Debt - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Nonrecourse Asset-Backed Debt, Aggregate Principal Amount $ 624,043,000 $ 663,791,000
Ineffectiveness recorded on designated hedges 0 0
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Debt Instrument [Line Items]    
Interest Expense 0 $ 0
Asset-Backed Nonrecourse 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  
Asset-Backed Nonrecourse 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