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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, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Income Tax Contingency [Line Items]        
Beginning balance $ 24,429 $ 32,101 $ 32,101  
Decrease—Lapse of statute of limitations   (5,981) [1] (5,981) $ (4,309)
Increases 76 76    
Foreign currency translation [2] (141) (1,767)    
Ending balance 24,364 24,429 24,364  
Unrecognized Tax Benefits [Member]        
Income Tax Contingency [Line Items]        
Beginning balance 19,946 25,998 25,998  
Decrease—Lapse of statute of limitations [1]   (4,620)    
Increases 0 0    
Foreign currency translation [2] (115) (1,432)    
Ending balance 19,831 19,946 19,831  
Interest And Penalties [Member]        
Income Tax Contingency [Line Items]        
Beginning balance 4,483 6,103 6,103  
Decrease—Lapse of statute of limitations [1]   (1,361)    
Increases 76 76    
Foreign currency translation [2] (26) (335)    
Ending balance $ 4,533 $ 4,483 $ 4,533  
[1] Recorded as an income tax benefit of $5,981 during the six months ended June 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 six months ended June 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 sterling.