VIE Arrangements - Additional Information (Details) - Variable Interest Entities $ in Millions	12 Months Ended
Dec. 31, 2013 USD ($) Entity
Variable Interest Entity [Line Items]
Number of entities \| Entity	3
Payments to acquire solar projects and the associated leases	$ 22.0
Decrease in additional paid-in-capital, net of tax	$ 2.8

Adjustment to additional paid in capital income tax effect net.

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- Definition

The number of businesses acquired by the entity during the period.

+ References

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+ Details

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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- Definition

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.

+ References

No definition available.

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