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Change In Acquisition-Related Contingent Consideration Liability (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Business Acquisition, Contingent Consideration [Line Items]    
Beginning balance $ 13,329 $ 16,426
Acquisition (4,495) [1] (848) [1]
Accretion of acquisition-related contingent consideration 279 731
Remeasurement of acquisition-related contingent consideration (2,122)  
Payments (63)  
Change in amount of contingent consideration 1,843 (731)
Ending balance 6,903 16,296
Foreign Currency Translation
   
Business Acquisition, Contingent Consideration [Line Items]    
Change in amount of contingent consideration $ (25) $ (13)
[1] Includes adjustments during the purchase price allocation period.