Unconsolidated Investments Mainly in Power Plants (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Unconsolidated investments	$ 4,068	$ 4,244
Sarulla
Schedule of Equity Method Investments [Line Items]
Unconsolidated investments	2,287	2,244
Watts And More Ltd
Schedule of Equity Method Investments [Line Items]
Unconsolidated investments	$ 1,781	$ 2,000

Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant