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 (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 (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Financing Receivables, payment due total $ 552.7hasi_FinancingReceivables
Financing Receivables, payment due in less than 1 year 14.0hasi_FinancingReceivableDueLessThanOneYear
Financing Receivables, payment due in 1-5 years 46.8hasi_FinancingReceivableDueOneToFiveYears
Financing Receivables, payment due in 5-10 years 46.9hasi_FinancingReceivableDueFiveToTenYears
Financing Receivables, payment due in more than 10 years 445.0hasi_FinancingReceivableDueMoreThanTenYears
Financing Receivables, weighted average yield total 5.47%hasi_FinancingReceivablesWeightedAverageYield
Financing Receivables, weighted average yield in less than 1 year 5.88%hasi_FinancingReceivablesWeightedAverageYieldDueLessThanOneYear
Financing Receivables, weighted average yield in 1-5 years 7.67%hasi_FinancingReceivablesWeightedAverageYieldDueOneToFiveYears
Financing Receivables, weighted average yield in 5-10 years 5.73%hasi_FinancingReceivablesWeightedAverageYieldDueFiveToTenYears
Financing Receivables, weighted average yield in more than 10 years 5.20%hasi_FinancingReceivablesWeightedAverageYieldDueMoreThanTenYears
Investments, payment due total 27us-gaap_Investments
Investments, payment due in less than 1 year 0hasi_InvestmentsDueLessThanOneYear
Investments, payment due in 1-5 years 14.1hasi_InvestmentsDueOneToFiveYears
Investments, payment due in 5-10 years 0hasi_InvestmentsDueFiveToTenYears
Investments, payment due in more than 10 years $ 13.2hasi_InvestmentsDueMoreThanTenYears
Investments, weighted average yield total 5.57%hasi_InvestmentsWeightedAverageYield
Investments, weighted average yield in less than 1 year 0.00%hasi_InvestmentsWeightedAverageYieldDueLessThanOneYear
Investments, weighted average yield in 1-5 years 5.76%hasi_InvestmentsWeightedAverageYieldDueOneToFiveYears
Investments, weighted average yield in 5-10 years 0.00%hasi_InvestmentsWeightedAverageYieldDueFiveToTenYears
Investments, weighted average yield in more than 10 years 5.37%hasi_InvestmentsWeightedAverageYieldDueMoreThanTenYears