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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
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Mar. 31, 2013
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Dec. 31, 2012
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| Deposits [Line Items] | ||
| Deposits | $ 5,000 | $ 5,000 |
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Hannon Armstrong Sustainable Infrastructure, L.P. [Member]
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| Deposits [Line Items] | ||
| Deposits | $ 5,000 |
| X | ||||||||||
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- Details
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- Definition
The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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