HA 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) (USD $)	3 Months Ended
	Mar. 31, 2015	Oct. 31, 2014
Schedule of Equity Method Investments [Line Items]
Loss from equity method investment in affiliate	$ (53,000)
Strong Upwind Holdings LLC [Member]
Schedule of Equity Method Investments [Line Items]
Project investment amount		144,000,000
Loss from equity method investment in affiliate	$ 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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