Quarterly report pursuant to Section 13 or 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 $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Financing receivables held-for-sale $ 40us-gaap_ReceivablesHeldForSaleAmount $ 62us-gaap_ReceivablesHeldForSaleAmount
Remaining loan balance non-accrual status 0.8hasi_RemainingLoanBalanceOnNonAccrualStatus  
Financing receivable allowance $ 1.2us-gaap_AllowanceForNotesAndLoansReceivableCurrent