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Our Portfolio - Financing Receivables, Investments and Real Estate - Future Amortization Expenses Related to Intangible Assets (Detail)

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Our Portfolio - Financing Receivables, Investments and Real Estate - Future Amortization Expenses Related to Intangible Assets (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Intangible Liability Disclosure [Abstract]    
From April 1, 2015 to December 31, 2015 $ 500,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 600,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2020 600,000hasi_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix  
Thereafter 21,300,000hasi_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearSix  
Net intangible assets $ 24,791,000us-gaap_FiniteLivedIntangibleAssetsNet $ 23,058,000us-gaap_FiniteLivedIntangibleAssetsNet