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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)

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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
 3 Months Ended
Mar. 31, 2015
Receivables [Abstract]  
Financing Receivables, payment due total $ 554hasi_FinancingReceivables
Financing Receivables, payment due in less than 1 year 5hasi_FinancingReceivableDueLessThanOneYear
Financing Receivables, payment due in 1-5 years 62hasi_FinancingReceivableDueOneToFiveYears
Financing Receivables, payment due in 5-10 years 36hasi_FinancingReceivableDueFiveToTenYears
Financing Receivables, payment due in more than 10 years 451hasi_FinancingReceivableDueMoreThanTenYears
Financing Receivables, weighted average yield total 5.40%hasi_FinancingReceivablesWeightedAverageYield
Financing Receivables, weighted average yield in less than 1 year 6.60%hasi_FinancingReceivablesWeightedAverageYieldDueLessThanOneYear
Financing Receivables, weighted average yield in 1-5 years 7.20%hasi_FinancingReceivablesWeightedAverageYieldDueOneToFiveYears
Financing Receivables, weighted average yield in 5-10 years 5.40%hasi_FinancingReceivablesWeightedAverageYieldDueFiveToTenYears
Financing Receivables, weighted average yield in more than 10 years 5.20%hasi_FinancingReceivablesWeightedAverageYieldDueMoreThanTenYears
Investments, payment due total 23us-gaap_Investments
Investments, payment due in less than 1 year 0hasi_InvestmentsDueLessThanOneYear
Investments, payment due in 1-5 years 14hasi_InvestmentsDueOneToFiveYears
Investments, payment due in 5-10 years 0hasi_InvestmentsDueFiveToTenYears
Investments, payment due in more than 10 years $ 9hasi_InvestmentsDueMoreThanTenYears
Investments, weighted average yield total 5.30%hasi_InvestmentsWeightedAverageYield
Investments, weighted average yield in less than 1 year 0.00%hasi_InvestmentsWeightedAverageYieldDueLessThanOneYear
Investments, weighted average yield in 1-5 years 5.80%hasi_InvestmentsWeightedAverageYieldDueOneToFiveYears
Investments, weighted average yield in 5-10 years 0.00%hasi_InvestmentsWeightedAverageYieldDueFiveToTenYears
Investments, weighted average yield in more than 10 years 4.60%hasi_InvestmentsWeightedAverageYieldDueMoreThanTenYears