Annual report pursuant to Section 13 and 15(d)

Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Components of Real Estate Portfolio (Detail)

v2.4.1.9
Our Portfolio - Financing Receivables, Investments, Real Estate and Equity Method Investments - Components of Real Estate Portfolio (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Real Estate Properties [Line Items]  
Real Estate $ 114.0us-gaap_RealEstateInvestmentPropertyNet
Land [Member]  
Real Estate Properties [Line Items]  
Real Estate 90.9us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_LandMember
Real Estate Related Intangibles [Member]  
Real Estate Properties [Line Items]  
Real Estate 23.3us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= hasi_RealEstateRelatedIntangiblesMember
Accumulated Amortization of Real Estate Intangibles [Member]  
Real Estate Properties [Line Items]  
Real Estate $ 0.2us-gaap_RealEstateInvestmentPropertyNet
/ us-gaap_RealEstatePropertiesAxis
= hasi_AmortizationOfIntangiblesMember