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Employee Benefit Plans (Pension Benefit Plan) - Schedule of Pension Benefit Plan Obligations and Funded Status (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period $ 43,902 $ 37,245  
Service cost 1,270 1,471 $ 1,193
Interest cost 444 634 727
Actuarial (gain) loss - experience (744) 453  
Actuarial loss - assumptions 2,458 5,091  
Benefit payments (509) (166)  
Effects of foreign currency exchange rate changes 4,106 (826)  
Projected benefit obligation at end of period 50,927 43,902 37,245
Change in plan assets:      
Fair value of plan assets at beginning of period 28,016 24,159  
Actual gain on plan assets 1,744 4,392  
Contributions 24    
Effects of foreign currency exchange rate changes 2,479 (535)  
Fair value of plan assets at end of period 32,263 28,016 $ 24,159
Unfunded status at end of period $ (18,664) $ (15,886)