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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Income Tax Contingency [Line Items]          
Beginning balance $ 22,427 $ 22,222 $ 27,016 $ 27,016  
Decrease -Lapse of statute of limitations     (5,171) [1] (5,171) $ (5,981)
Increases 39 40      
Foreign currency translation [2] (594) 165 338    
Ending balance 21,872 22,427 22,222 21,872  
Unrecognized Tax Benefits [Member]          
Income Tax Contingency [Line Items]          
Beginning balance 18,702 18,564 21,850 21,850  
Decrease -Lapse of statute of limitations [1]     (3,559)    
Increases    
Foreign currency translation [2] (496) 138 273    
Ending balance 18,206 18,702 18,564 18,206  
Interest And Penalties [Member]          
Income Tax Contingency [Line Items]          
Beginning balance 3,725 3,658 5,166 5,166  
Decrease -Lapse of statute of limitations [1]     (1,612)    
Increases 39 40 39    
Foreign currency translation [2] (98) 27 65    
Ending balance $ 3,666 $ 3,725 $ 3,658 $ 3,666  
[1] Recorded as an income tax benefit of $5,171 during the nine months ended September 30, 2021, along with an equal and offsetting amount recorded in other gains and losses, net, to recognize a reduction in the indemnification asset. During the nine months ended September 30, 2020, an income tax benefit of $5,981 was recorded along with an equal and offsetting amount in other gains and losses, net.
[2] The gross unrecognized tax benefits were accrued in British pounds.