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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 02, 2011
May 02, 2011
Mar. 28, 2011
Business Acquisition [Line Items]            
Business Acquisition cash price consideration     $ 4,066 $ 10,500   $ 6,500
Percentage of common stock owned 51.00%       51.00%  
Contribution made to acquire ownership percentage 49.00%       49.00%  
Net cash received by the company         38,224  
Cumulative amount required to accrete the initial carrying amount to the redemption value 219 4,798        
Estimated redemption value of the put option 10,290 10,290        
Percent of Interest in Joint Venture       20.00%    
Nishikawa Rubber [Member]
           
Business Acquisition [Line Items]            
Percent of Interest in Joint Venture       77.70%    
Original Tachaplalerts And Marubeni Thailand [Member]
           
Business Acquisition [Line Items]            
Percent of Interest in Joint Venture       2.30%    
Corporate Joint Venture [Member]
           
Business Acquisition [Line Items]            
Fair value of assets acquired         $ 33,000