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Accumulated Other Comprehensive Income/(Loss) - Components of Other Comprehensive Income / (Loss) and Tax Effects Allocated to Other Comprehensive Income / (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]      
Beginning Balance $ (626) $ (665) $ (582)
Acquisition / (surrender) of additional units of consolidated subsidiary, net (23) (4)  
Accumulated other comprehensive income (loss) after acquisition / (surrender) of additional units of consolidated subsidiary, net (649) (669)  
Change in foreign currency items 154 43 (83)
Other comprehensive income, net 154 43 (83)
Ending Balance (495) (626) (665)
Foreign currency items [Member]
      
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]      
Beginning Balance (626) (665) (582)
Acquisition / (surrender) of additional units of consolidated subsidiary, net (23) (4)  
Accumulated other comprehensive income (loss) after acquisition / (surrender) of additional units of consolidated subsidiary, net (649) (669)  
Change in foreign currency items 154 43 (83)
Other comprehensive income, net 154 43 (83)
Ending Balance (495) (626) (665)
Tax effect [Member]
      
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]      
Beginning Balance         
Acquisition / (surrender) of additional units of consolidated subsidiary, net        
Accumulated other comprehensive income (loss) after acquisition / (surrender) of additional units of consolidated subsidiary, net        
Change in foreign currency items         
Other comprehensive income, net         
Ending Balance