Annual report pursuant to Section 13 and 15(d)

Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Summary of Anticipated Maturity Dates of Financing Receivables and Investments and Weighted Average Yield (Parenthetical) (Detail)

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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Summary of Anticipated Maturity Dates of Financing Receivables and Investments and Weighted Average Yield (Parenthetical) (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2012
Receivables [Abstract]      
Financing receivables held-for-sale $ 62,300,000us-gaap_ReceivablesHeldForSaleAmount $ 24,800,000us-gaap_ReceivablesHeldForSaleAmount  
Allowance for credit losses 1,200,000us-gaap_FinancingReceivableAllowanceForCreditLosses 11,000,000us-gaap_FinancingReceivableAllowanceForCreditLosses 0us-gaap_FinancingReceivableAllowanceForCreditLosses
Remaining loan balance non-accrual status 800,000hasi_RemainingLoanBalanceOnNonAccrualStatus    
Financing receivable allowance $ 1,200,000us-gaap_AllowanceForNotesAndLoansReceivableCurrent