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Accrued Severance Benefits - Changes in Accrued Severance Benefits (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Postemployment Benefits [Abstract]          
Beginning balance $ 50,771 $ 52,553 $ 51,567 $ 54,452  
Provisions 1,570 1,736 3,240 3,507  
Severance payments (1,545) (1,343) (2,934) (2,836)  
Translation adjustments (3,210) 159 (4,287) (2,018)  
Ending balance 47,586 53,105 47,586 53,105  
Less: Cumulative contributions to severance insurance deposit accounts (16,894) (13,316) (16,894) (13,316)  
The National Pension Fund (44) (59) (44) (59)  
Group severance insurance plan (182) (210) (182) (210)  
Accrued severance benefits, net $ 30,466 $ 39,520 $ 30,466 $ 39,520 $ 33,064