Annual report pursuant to Section 13 and 15(d)

Income Tax - Additional Information (Detail)

v2.4.1.9
Income Tax - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2012
Income Tax Holiday [Line Items]                  
Income tax (expense) benefit $ (189,000)us-gaap_IncomeTaxExpenseBenefit $ (607,000)us-gaap_IncomeTaxExpenseBenefit $ 830,000us-gaap_IncomeTaxExpenseBenefit $ (60,000)us-gaap_IncomeTaxExpenseBenefit $ 251,000us-gaap_IncomeTaxExpenseBenefit   $ (26,000)us-gaap_IncomeTaxExpenseBenefit $ 251,000us-gaap_IncomeTaxExpenseBenefit  
Net deferred tax liabilities 100,000us-gaap_DeferredTaxLiabilities       1,800,000us-gaap_DeferredTaxLiabilities   100,000us-gaap_DeferredTaxLiabilities 1,800,000us-gaap_DeferredTaxLiabilities  
Deferred tax assets, operating loss carryforwards, subject to expiration 4,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration           4,400,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration    
State net operating loss carryforward expiration period             2034    
Federal net operating loss carryforward expiration period             2034    
Federal income tax expense (Benefit)           0us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations     0us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State and local income tax expense (Benefit)           0us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations     0us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Federal Income Tax [Member]                  
Income Tax Holiday [Line Items]                  
Dividends payable, date declared 2015-01       2014-01   2015-01 2014-01  
Dividend payable, date to be paid             Dec. 19, 2014 Dec. 30, 2013  
TRS [Member]                  
Income Tax Holiday [Line Items]                  
Deferred tax assets, Valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
    2,500,000us-gaap_DeferredTaxAssetsValuationAllowance
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
0us-gaap_DeferredTaxAssetsValuationAllowance
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
  0us-gaap_DeferredTaxAssetsValuationAllowance
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
0us-gaap_DeferredTaxAssetsValuationAllowance
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
 
Income tax (expense) benefit             0us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
300,000us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
 
Effective income tax rate reconciliation, at federal statutory income tax rate, Percent             35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
   
Effective income tax rate reconciliation, State and local income taxes, Percent             5.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
   
Effective tax rate             0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
   
Combined statutory tax rate             40.00%hasi_IncomeTaxExpenseBenefitCombinedFederalAndStateIncomeTaxRate
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
   
Release of valuation allowance             2,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
   
Net deferred tax liabilities 100,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
      1,800,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
  100,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
1,800,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
 
Federal income tax expense (Benefit)             0us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
(200,000)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
 
State and local income tax expense (Benefit)               (100,000)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
 
Additional Paid-in Capital [Member] | TRS [Member]                  
Income Tax Holiday [Line Items]                  
Tax impact on additional paid in capital       $ 1,900,000us-gaap_DeferredTaxAssetsLiabilitiesNet
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember