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

Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investment in Affiliate - Additional Information (Detail)

Equity Method Investment in Affiliate - Additional Information (Detail) (HA EnergySource [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
HA EnergySource [Member]
Schedule of Equity Method Investments [Line Items]
Capital commitment, approved					$ 3.40
Management services to EnergySource	$ 0.03	$ 8.40	$ 0.50	$ 8.80

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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