Annual report pursuant to Section 13 and 15(d)

Credit Facilities - Additional Information (Detail)

v2.4.1.9
Credit Facilities - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Sep. 30, 2012
May 31, 2014
Dec. 31, 2013
Jul. 31, 2013
Line of Credit Facility [Line Items]            
Credit facility outstanding $ 315,748,000us-gaap_LineOfCredit $ 315,748,000us-gaap_LineOfCredit     $ 77,114,000us-gaap_LineOfCredit  
Termination of credit facility Jul. 19, 2019          
Issuance costs   10,800,000us-gaap_DebtIssuanceCosts        
Pledge of investments in financing receivables 422,400,000us-gaap_PledgedAssetsSeparatelyReportedFinanceReceivablesPledgedAsCollateralAtFairValue 422,400,000us-gaap_PledgedAssetsSeparatelyReportedFinanceReceivablesPledgedAsCollateralAtFairValue     114,300,000us-gaap_PledgedAssetsSeparatelyReportedFinanceReceivablesPledgedAsCollateralAtFairValue  
Weighted average short-term borrowing rate 2.40%us-gaap_ShortTermDebtWeightedAverageInterestRate 2.40%us-gaap_ShortTermDebtWeightedAverageInterestRate     2.60%us-gaap_ShortTermDebtWeightedAverageInterestRate  
Fees for loan agreement description   Fees for each Loan Agreement equal to 0.50%, divided by 360, multiplied by the excess of the available borrowing capacity under each Loan Agreement over the actual amount borrowed under such Loan Agreement.        
Default underlying financings   50.00%hasi_DefaultUnderlyingFinancing        
Senior Secured Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Credit facility outstanding     4,600,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
    350,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Maximum advances on credit facilities 1,350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
1,350,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
       
Interest paid on credit facilities     300,000us-gaap_LineOfCreditFacilityPeriodicPaymentInterest
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Qualifying Government and Institutional Loans (G&I Facility) [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease) in overall capacity (25,000,000)us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
         
Termination of credit facility   Jul. 19, 2019        
Maximum advances on credit facilities 375,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
375,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
       
Maximum borrowings allowed at any point in time 125,000,000hasi_LineOfCreditFacilityMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
125,000,000hasi_LineOfCreditFacilityMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
       
Line of credit facility, decrease in maximum borrowing capacity 75,000,000hasi_LineOfCreditFacilityDecreaseInMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
         
London Interbank Offered Rate   ("LIBOR") plus 1.50%        
Floating interest rate   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
       
Issuance costs 20,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
         
Qualifying Government and Institutional Loans (G&I Facility) [Member] | Federal Funds [Member]            
Line of Credit Facility [Line Items]            
London Interbank Offered Rate   Federal Funds Rate plus 1.50%        
Floating interest rate   1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
/ us-gaap_InformationByFinancialStatementLineItemAxis
= hasi_FederalFundsMember
       
Qualifying Government and Institutional Loans (G&I Facility) [Member] | Credit Default Option [Member]            
Line of Credit Facility [Line Items]            
London Interbank Offered Rate   LIBOR plus 2.50%        
Floating interest rate   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CreditDefaultOptionMember
       
Qualifying Government and Institutional Loans (G&I Facility) [Member] | U.S. Federal Government [Member]            
Line of Credit Facility [Line Items]            
Applicable valuation percentages   80.00%hasi_ValuationAllowancePercentage
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
/ us-gaap_InvestmentTypeAxis
= hasi_UsFederalGovernmentMember
       
Qualifying Government and Institutional Loans (G&I Facility) [Member] | Institutional [Member]            
Line of Credit Facility [Line Items]            
Applicable valuation percentages   75.00%hasi_ValuationAllowancePercentage
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
/ us-gaap_InvestmentTypeAxis
= hasi_InstitutionalMember
       
Qualifying Government and Institutional Loans (G&I Facility) [Member] | Senior Secured Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Credit facility outstanding 125,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
125,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
       
Maximum advances on credit facilities 375,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
375,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingGovernmentAndInstitutionalLoansMember
       
Qualifying Project Finance Loans (PF Facility) [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease) in overall capacity 475,000,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
         
Line of credit facility, increase in maximum borrowing capacity 75,000,000hasi_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
         
Termination of credit facility   Jul. 19, 2019        
Maximum advances on credit facilities 975,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
975,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
Maximum borrowings allowed at any point in time 325,000,000hasi_LineOfCreditFacilityMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
325,000,000hasi_LineOfCreditFacilityMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
London Interbank Offered Rate   LIBOR plus 2.50%        
Floating interest rate   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
Issuance costs 20,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
         
Applicable valuation percentages   67.00%hasi_ValuationAllowancePercentage
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
Qualifying Project Finance Loans (PF Facility) [Member] | Federal Funds [Member]            
Line of Credit Facility [Line Items]            
London Interbank Offered Rate   Federal Funds Rate plus 2.50%        
Floating interest rate   2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_InformationByFinancialStatementLineItemAxis
= hasi_FederalFundsMember
       
Qualifying Project Finance Loans (PF Facility) [Member] | Credit Default Option [Member]            
Line of Credit Facility [Line Items]            
London Interbank Offered Rate   LIBOR plus 5.00%        
Floating interest rate   5.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CreditDefaultOptionMember
       
Qualifying Project Finance Loans (PF Facility) [Member] | Senior Secured Revolving Credit Facility [Member]            
Line of Credit Facility [Line Items]            
Credit facility outstanding 325,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
325,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
Maximum advances on credit facilities 975,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
975,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
       
Qualifying Project Finance Loans (PF Facility) [Member] | Minimum [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease) in overall capacity       200,000,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Line of credit facility, increase in maximum borrowing capacity       100,000,000hasi_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Qualifying Project Finance Loans (PF Facility) [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Line of credit facility, increase (decrease) in overall capacity       500,000,000us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Line of credit facility, increase in maximum borrowing capacity       $ 250,000,000hasi_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacityAllowedAtAnyPoint
/ us-gaap_DebtInstrumentAxis
= hasi_QualifyingProjectFinanceLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember