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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Income Tax Contingency [Line Items]          
Beginning balance $ 24,364 $ 24,429 $ 32,101 $ 32,101  
Decrease -Lapse of statute of limitations     (5,981) [1] (5,981) $ (4,309)
Increases 81 76 76    
Foreign currency translation [2] 1,057 (141) (1,767)    
Ending balance 25,502 24,364 24,429 25,502  
Unrecognized Tax Benefits [Member]          
Income Tax Contingency [Line Items]          
Beginning balance 19,831 19,946 25,998 25,998  
Decrease -Lapse of statute of limitations [1]     (4,620)    
Foreign currency translation [2] 860 (115) (1,432)    
Ending balance 20,691 19,831 19,946 20,691  
Interest And Penalties [Member]          
Income Tax Contingency [Line Items]          
Beginning balance 4,533 4,483 6,103 6,103  
Decrease -Lapse of statute of limitations [1]     (1,361)    
Increases 81 76 76    
Foreign currency translation [2] 197 (26) (335)    
Ending balance $ 4,811 $ 4,533 $ 4,483 $ 4,811  
[1] Recorded as an income tax benefit of $5,981 during the nine months ended September 30, 2020, 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, 2019, an income tax benefit of $4,309 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.