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v2.4.0.6

GEOTHERMAL (Details) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Noncontrolling Interest [Line Items] |  |
Ownership percentage (in hundredths) | 19.54% | 22.40%

X
- Details
Name: | us-gaap_MinorityInterestLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant