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Fair value measurement - Reconciliation of changes in three financial liabilities measured at fair value on recurring (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in Level 3 Financial Liabilities Related to Contingent Consideration [Roll Forward]    
Beginning balance $ 219,908 $ 304,248
Payments (146,971) (138,171)
Initial estimate upon acquisition and revaluations (36,714) 53,915
Translation adjustment 410 (84)
Ending balance 36,633 $ 219,908
NeoTract, Inc    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Payment for contingent consideration liability $ 140,600