Quarterly report pursuant to Section 13 or 15(d)

Nonrecourse Debt - Additional Information (Detail)

v2.4.1.9
Nonrecourse Debt - Additional Information (Detail) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2015
Dec. 31, 2013
Oct. 31, 2014
Dec. 31, 2014
Debt Instrument [Line Items]        
Nonrecourse Asset-Backed Loan Agreement $ 208,585,000us-gaap_NonRecourseDebt     $ 208,246,000us-gaap_NonRecourseDebt
Cost on issuance of Notes 11,000,000us-gaap_DebtIssuanceCosts      
Strong Upwind Holdings LLC [Member]        
Debt Instrument [Line Items]        
Ownership percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= hasi_StrongUpwindHoldingsLlcMember
 
Asset-Backed Nonrecourse Notes [Member]        
Debt Instrument [Line Items]        
Nonrecourse Asset-Backed Loan Agreement   100,000,000us-gaap_NonRecourseDebt
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
   
Nonrecourse Asset-Backed Loan Agreement, interest rate   2.79%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
   
Nonrecourse Asset-Backed Loan Agreement, maturity period 2019-12      
Outstanding Notes 90,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
    92,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Amount of financing receivables pledged for Asset-Backed Notes 104,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
    104,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
Anticipated debt balance at maturity   57,000,000hasi_DebtPrincipalAmountDueUponMaturity
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
   
Prepayment penalty, maturity date 2018-12      
Make whole payment discount rate   0.50%hasi_DebtInstrumentMakeWholePaymentDiscountRate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseNotesMember
   
Asset-Backed Nonrecourse Loan Agreement [Member]        
Debt Instrument [Line Items]        
Nonrecourse Asset-Backed Loan Agreement     115,000,000us-gaap_NonRecourseDebt
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Nonrecourse Asset-Backed Loan Agreement, interest rate     5.74%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Nonrecourse Asset-Backed Loan Agreement, maturity period 2021-09      
Percentage of minimum principal payment amount Minimum principal payment amount equal to one-half percent (0.5%) of the principal amount of the loan plus additional principal payments based on available cash flow and a target debt balance.      
Repayment of remaining debt balance in 2021     20,000,000hasi_ExpectedRemainingDebtAtMaturityDate
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Default interest rate on debt in an event of default     7.74%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Cost on issuance of Notes     2,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Asset-Backed Nonrecourse Loan Agreement [Member] | Ha Wind LLC [Member]        
Debt Instrument [Line Items]        
Ownership percentage     100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= hasi_HaWindMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Asset-Backed Nonrecourse Loan Agreement [Member] | Strong Upwind Holdings LLC [Member]        
Debt Instrument [Line Items]        
Ownership percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= hasi_StrongUpwindHoldingsLlcMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_AssetBackedNonRecourseLoanMember
 
Other Nonrecourse Debt [Member]        
Debt Instrument [Line Items]        
Amount of financing receivables pledged for Asset-Backed Notes $ 95,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember
    $ 108,000,000us-gaap_PledgedAssetsNotSeparatelyReportedFinanceReceivables
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= hasi_OtherNonRecourseDebtMember