Annual report pursuant to Section 13 and 15(d)

Income Tax - Summary of Deferred Tax Assets (Liabilities) (Detail)

v2.4.1.9
Income Tax - Summary of Deferred Tax Assets (Liabilities) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Financing receivable basis difference $ (5.6)us-gaap_IncreaseDecreaseInNotesReceivables $ (3.0)us-gaap_IncreaseDecreaseInNotesReceivables
Deferred tax liabilities, Other (0.2)us-gaap_DeferredTaxLiabilitiesOther  
Gross deferred tax liabilities (5.8)us-gaap_DeferredIncomeTaxLiabilities (3.0)us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets, Net operating loss (NOL) carryforwards 4.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 1.0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets, Equity-based compensation 0.8hasi_DeferredTaxAssetEquityBasedCompensation 0.2hasi_DeferredTaxAssetEquityBasedCompensation
Deferred tax assets, Other 0.5us-gaap_DeferredTaxAssetsOther  
Gross deferred tax assets 5.7us-gaap_DeferredTaxAssetsGross 1.2us-gaap_DeferredTaxAssetsGross
Net deferred tax liabilities $ (0.1)us-gaap_DeferredTaxLiabilities $ (1.8)us-gaap_DeferredTaxLiabilities