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Change In Acquisition-Related Contingent Consideration Liability (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]        
Beginning balance $ 6,601 $ 13,285 $ 13,329 $ 16,426
Acquisition   (206) [1] (4,495) [1] 4,323 [1]
Accretion of acquisition-related contingent consideration 257 630 792 2,125
Remeasurement of acquisition-related contingent consideration 0 0 (2,383) (8,216)
Payments (200) (166) (578) (401)
Change in amount of contingent consideration (257) (630) 1,591 6,091
Ending balance 6,658 13,616 6,658 13,616
Foreign Currency Translation
       
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration   $ 73 $ (7) $ (641)
[1] Includes adjustments during the purchase price allocation period.