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

Annual report pursuant to Section 13 and 15(d)

Equity Method Investment in Affiliate - Additional Information (Detail)

Equity Method Investment in Affiliate - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule of Equity Method Investments [Line Items]
Loss from equity method investment in affiliate	$ (448,000)	$ (799,000)		$ (1,284,000)	$ (5,047,000)
HA EnergySource [Member]
Schedule of Equity Method Investments [Line Items]
Capital commitment, approved			3,400,000
Loss from equity method investment in affiliate	(500,000)		0	(1,300,000)	(5,000,000)
Cash distributions of excess financing proceeds				12,600,000
Deemed distributions				1,700,000
Investments in affiliates			0	800,000
Management services to EnergySource			$ 500,000	$ 8,800,000	$ 100,000

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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