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Income Taxes - Summary of the Detail of Income Tax Expense for the Periods (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Current:        
US     $ 15,244 $ 8,469
Korea     1,928 2,367
Total Current Taxes     17,172 10,836
Deferred:        
US     5,105 5,278
Korea     (683) (2,572)
Total Deferred Taxes $ 1,925 $ 1,483 4,422 2,706
Total Income Tax Expense $ 6,691 $ 3,628 $ 21,594 $ 13,542