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Change In Acquisition-Related Contingent Consideration Liability (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]        
Beginning balance $ 6,903 $ 16,296 $ 13,329 $ 16,426
Acquisition   5,377 [1] (4,495) [1] 4,528 [1]
Accretion of acquisition-related contingent consideration 255 764 535 1,495
Remeasurement of acquisition-related contingent consideration (261) (8,216) (2,383) (8,216)
Payments (314) (235) (378) (235)
Change in amount of contingent consideration 5 7,452 1,848 6,721
Ending balance 6,601 13,285 6,601 13,285
Foreign Currency Translation
       
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration $ 18 $ (701) $ (7) $ (713)
[1] Includes adjustments during the purchase price allocation period.