Quarterly report pursuant to Section 13 or 15(d)

The Company - Summary of Unaudited Pro Forma Information (Detail)

v2.4.1.9
The Company - Summary of Unaudited Pro Forma Information (Detail) (AWCC [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
AWCC [Member]
 
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Pro forma net investment revenue $ 6.9us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= hasi_AwccMember
Pro forma net income $ 3.3us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= hasi_AwccMember