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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Components of Financing Receivables (Detail)

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Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Components of Financing Receivables (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing receivables    
Financing or minimum lease payments $ 733,000,000us-gaap_LoansAndLeasesReceivableCommercial $ 723,000,000us-gaap_LoansAndLeasesReceivableCommercial
Unearned interest income (175,000,000)hasi_CapitalLeasesNetInvestmentInSalesTypeLeasesUnearnedInterestIncome (166,000,000)hasi_CapitalLeasesNetInvestmentInSalesTypeLeasesUnearnedInterestIncome
Allowance for credit losses (1,200,000)us-gaap_FinancingReceivableAllowanceForCreditLosses (1,200,000)us-gaap_FinancingReceivableAllowanceForCreditLosses
Unearned fee income, net of initial direct costs (3,000,000)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesExecutoryCosts (3,000,000)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesExecutoryCosts
Financing receivables $ 553,600,000us-gaap_LongTermInvestmentsAndReceivablesNet $ 552,706,000us-gaap_LongTermInvestmentsAndReceivablesNet