Quarterly report pursuant to Section 13 or 15(d)

Income Tax - Additional Information (Detail)

v2.4.1.9
Income Tax - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Holiday [Line Items]      
Income tax (expense) benefit $ 23,000us-gaap_IncomeTaxExpenseBenefit $ (60,000)us-gaap_IncomeTaxExpenseBenefit  
TRS [Member]      
Income Tax Holiday [Line Items]      
Income tax (expense) benefit 0us-gaap_IncomeTaxExpenseBenefit
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
(100,000)us-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
   
Net deferred tax liabilities $ 100,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember
  $ 100,000us-gaap_DeferredTaxLiabilities
/ dei_LegalEntityAxis
= hasi_RealEstateInvestmentTrustSubsidiariesMember