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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Contingency [Line Items]    
Beginning balance $ 32,101 $ 34,876
Decrease -Lapse of statute of limitations (5,981) (4,309)
Increases 320 416
Foreign currency translation [1] 576 1,118
Ending balance 27,016 32,101
Unrecognized Tax Benefits [Member]    
Income Tax Contingency [Line Items]    
Beginning balance 25,998 28,101
Decrease -Lapse of statute of limitations (4,620) (2,999)
Foreign currency translation [1] 472 896
Ending balance 21,850 25,998
Interest And Penalties [Member]    
Income Tax Contingency [Line Items]    
Beginning balance 6,103 6,775
Decrease -Lapse of statute of limitations (1,361) (1,310)
Increases 320 416
Foreign currency translation [1] 104 222
Ending balance $ 5,166 $ 6,103
[1] The gross unrecognized tax benefits were accrued in British pounds.