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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Income Tax Contingency [Line Items]        
Beginning balance $ 22,222 $ 27,016 $ 27,016  
Decrease -Lapse of statute of limitations   (5,171) [1] (5,171) $ (5,981)
Increases 40 39    
Foreign currency translation [2] 165 338    
Ending balance 22,427 22,222 22,427  
Unrecognized Tax Benefits [Member]        
Income Tax Contingency [Line Items]        
Beginning balance 18,564 21,850 21,850  
Decrease -Lapse of statute of limitations [1]   (3,559)    
Foreign currency translation [2] 138 273    
Ending balance 18,702 18,564 18,702  
Interest And Penalties [Member]        
Income Tax Contingency [Line Items]        
Beginning balance 3,658 5,166 5,166  
Decrease -Lapse of statute of limitations [1]   (1,612)    
Increases 40 39    
Foreign currency translation [2] 27 65    
Ending balance $ 3,725 $ 3,658 $ 3,725  
[1] Recorded as an income tax benefit of $5,171 during the six months ended June 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 six months ended June 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.