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Unconsolidated Investments Mainly in Power Plants (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Unconsolidated investments $ 2,591 $ 3,757 $ 4,244
Sarulla
     
Schedule of Equity Method Investments [Line Items]      
Unconsolidated investments 2,591 2,215  
Watts & More Ltd.
     
Schedule of Equity Method Investments [Line Items]      
Unconsolidated investments   $ 1,542