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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Business Acquisition, Contingent Consideration [Line Items]        
Beginning balance $ 15,276 $ 20,076 $ 14,990 $ 19,864
Acquisition date fair value measurement   3,000   3,000
Change in amount of contingent consideration 3,541 (799) 2,984 (1,595)
Payments (917)   (1,287) (577)
Elimination of contingency (2,534) [1]   (2,534) [1]  
Ending balance 8,237 23,882 8,237 23,882
Fair Value Adjustment
        
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration (3,541) [2] 799 [2] (2,984) [2] 1,595 [2]
Foreign Currency Translation
        
Business Acquisition, Contingent Consideration [Line Items]        
Change in amount of contingent consideration $ (47) $ 7 $ 52  
[1] During the three months ended June 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.
[2] Adjustments to fair value related to accretion and remeasurement of contingent consideration are recorded in "Acquisition-related contingent consideration" on the Condensed Consolidated Statements of Comprehensive Income (Loss). We recognized a gain on remeasurement of contingent consideration of $4.1 million during the three and six months ended June 30, 2012, and accretion expense of $0.6 million and $1.1 million, respectively.