Indebtedness - Summary of Debt (Parenthetical) (Detail) - Solar Bonds and Solar Bonds Issued to Related Parties [Member] - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Maximum amount to be borrowed	$ 350,000,000	$ 200,000,000
Remaining Borrowing Capacity	$ 135,700,000	$ 196,100,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

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- Details

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