Annual report pursuant to Section 13 and 15(d)

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 $)
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2012
Financing receivables      
Financing or minimum lease payments $ 723,100,000us-gaap_LoansAndLeasesReceivableCommercial $ 504,700,000us-gaap_LoansAndLeasesReceivableCommercial  
Unearned interest income (166,000,000)hasi_CapitalLeasesNetInvestmentInSalesTypeLeasesUnearnedInterestIncome (142,300,000)hasi_CapitalLeasesNetInvestmentInSalesTypeLeasesUnearnedInterestIncome  
Allowance for credit losses (1,200,000)us-gaap_FinancingReceivableAllowanceForCreditLosses (11,000,000)us-gaap_FinancingReceivableAllowanceForCreditLosses 0us-gaap_FinancingReceivableAllowanceForCreditLosses
Unearned fee income, net of initial direct costs (3,200,000)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesExecutoryCosts (3,500,000)us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeasesExecutoryCosts  
Financing receivables $ 552,706,000us-gaap_LongTermInvestmentsAndReceivablesNet $ 347,871,000us-gaap_LongTermInvestmentsAndReceivablesNet