Hannon Armstrong Sustainable Infrastructure Capital, Inc. Quarterly report pursuant to Section 13 or 15(d)

Our Portfolio - Financing Receivables, Investments and Real Estate - Summary of Anticipated Maturity Dates of Financing Receivables and Investments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Receivables [Abstract]
Financing Receivables, payment due total	$ 456,073
Financing Receivables, payment due in less than 1 year	1,845
Financing Receivables, payment due in 1-5 years	89,083
Financing Receivables, payment due in 5-10 years	18,034
Financing Receivables, payment due in more than 10 years	347,111
Investments available-for-sale, payment due total	67,640	3,213
Investments available-for-sale, payment due in less than 1 year
Investments available-for-sale, payment due in 1-5 years	16,552
Investments available-for-sale, payment due in 5-10 years
Investments available-for-sale, payment due in more than 10 years	$ 51,088