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Investments in Equity Method Affiliates - Schedule of Summary Data of Equity Method Investees (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investments in Equity Accounted Investees [Line Items]      
Total Assets $ 279,874 $ 257,735  
Liabilities 96,981 68,530  
Equity attributable to the investees 182,277 188,170  
Non-controlling interest 616 1,035  
Liabilities & Equity 279,874 257,735  
Net income / (loss) 2,248 12,786 62,664
Net income / (loss) attributable to the investees $ 2,667 $ 12,818 $ 62,583