Annual report pursuant to Section 13 and 15(d)

Income Tax - Reconciliation between Statutory Rates and Effective Tax Rates (Detail)

v3.6.0.2
Income Tax - Reconciliation between Statutory Rates and Effective Tax Rates (Detail)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
U.S Federal & State combined statutory income tax rate 40.00% 40.00% 40.00%
Share Based Compensation (427.00%)    
Equity Method Investments (968.00%) 5.00%  
Other 11.00%    
Valuation Allowance 1344.00% (46.00%) (40.00%)
HASI Effective Tax Rate 0.00% (1.00%) 0.00%