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

Annual report pursuant to Section 13 and 15(d)

Defined Contribution Plan - Additional Information (Detail)

Defined Contribution Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2012
Defined Contribution Benefit Plans [Line Items]
Contribution plan cost	$ 0.2	$ 0.2	$ 0.1
Defined contribution plan matching contribution, Description	Under the plan, we provide a dollar for dollar match for the first 3% of the employee's contributions and a $0.50 per dollar match for the next 2% of employee contributions.
First 3% of Employee's Contribution [Member]
Defined Contribution Benefit Plans [Line Items]
Defined contribution plan employer's matching contribution, Percentage of match	100.00%
Next 2% of Employee's Contribution [Member]
Defined Contribution Benefit Plans [Line Items]
Defined contribution plan employer's matching contribution, Percentage of match	50.00%

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

+ References + Details