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Nonrecourse Debt - Analysis of Other Nonrecourse Debt by Interest Rate (Parenthetical) (Detail)
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Mar. 31, 2015
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Dec. 31, 2014
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| Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.06% to 5.00% Per Annum [Member] |
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| Debt Instrument [Line Items] |
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| Fixed-rate promissory notes, interest rates |
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2.06%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromTwoPointZeroSixPercentToFivePercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
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| Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 5.01% to 6.50% Per Annum [Member] |
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| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
5.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromFivePointZeroOnePercentToSixPointFiveZeroPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
5.01%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromFivePointZeroOnePercentToSixPointFiveZeroPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
| Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 6.51% to 8.00% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
6.51%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromSixPointFiveOnePercentToEightPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
6.51%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromSixPointFiveOnePercentToEightPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
| Minimum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.26% to 5.00% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
2.26%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromTwoPointTwoSixPercentToFivePercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
|
| Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.06% to 5.00% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
|
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromTwoPointZeroSixPercentToFivePercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
| Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 5.01% to 6.50% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromFivePointZeroOnePercentToSixPointFiveZeroPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromFivePointZeroOnePercentToSixPointFiveZeroPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
| Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 6.51% to 8.00% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromSixPointFiveOnePercentToEightPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromSixPointFiveOnePercentToEightPercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
| Maximum [Member] | Fixed-Rate Promissory Notes, Interest Rates from 2.26% to 5.00% Per Annum [Member] |
|
|
| Debt Instrument [Line Items] |
|
|
| Fixed-rate promissory notes, interest rates |
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hasi_FixedRatePromissoryNotesInterestRatesFromTwoPointTwoSixPercentToFivePercentPerAnnumMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
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