Annual report pursuant to Section 13 and 15(d)

Intangible Assets and Goodwill - Schedule of Non Real Estate Intangible Assets and Goodwill (Detail)

v2.4.1.9
Intangible Assets and Goodwill - Schedule of Non Real Estate Intangible Assets and Goodwill (Detail) (USD $)
Dec. 31, 2014
May 31, 2007
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets   $ 5,100,000us-gaap_FiniteLivedIntangibleAssetsGross  
Net intangible assets 23,058,000us-gaap_FiniteLivedIntangibleAssetsNet    
Non Real Estate [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets 5,100,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
  5,100,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
Accumulated amortization (3,600,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
  (3,400,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
Net intangible assets 1,500,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
  1,700,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
Goodwill 5,900,000us-gaap_Goodwill
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
  3,800,000us-gaap_Goodwill
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
Non Real Estate [Member] | Trade Names and Securitization Structuring Costs [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets 3,100,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hasi_TradeNamesAndSecuritizationStructuringCostsMember
  3,100,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hasi_TradeNamesAndSecuritizationStructuringCostsMember
Non Real Estate [Member] | Other Fully Amortized Intangibles [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets $ 2,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hasi_OtherFullyAmortizedIntangiblesMember
  $ 2,000,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= hasi_NonRealEstateMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hasi_OtherFullyAmortizedIntangiblesMember