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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, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Business Acquisition, Contingent Consideration [Line Items]        
Beginning balance $ 13,285 $ 8,237 $ 16,426 $ 14,990
Acquisition (206) [1] 1,150 [1] 4,323 [1] 1,150 [1]
Change in amount of contingent consideration (630) (403) 6,091 2,581
Payments (166)   (401) (1,287)
Elimination of contingency       (2,534) [2]
Ending balance 13,616 9,850 13,616 9,850
Fair Value Adjustment
        
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration 630 [3] 403 [3] (6,091) [3] (2,581) [3]
Foreign Currency Translation
        
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration $ 73 $ 60 $ (641) $ 112
[1] Includes adjustments during the purchase price allocation period.
[2] During the nine months ended September 30, 2012, we fixed an acquisition-related contingent consideration liability in the amount of $2.5 million. The non-contingent consideration liability is no longer required to be remeasured to fair value and, accordingly, is not classified as a Level 3 measurement.
[3] Includes adjustments to fair value related to accretion and remeasurement of contingent consideration which are recorded in "Acquisition-related contingent consideration" on the Condensed Consolidated Statements of Comprehensive Income (Loss).