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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period $ 37,245 $ 34,893  
Service cost 1,471 1,193 $ 1,260
Interest cost 634 727 607
Actuarial loss - experience 453 38  
Actuarial loss - assumptions 5,091 2,139  
Benefit payments (166) (138)  
Effects of foreign currency exchange rate changes (826) (1,607)  
Projected benefit obligation at end of period 43,902 37,245 34,893
Change in plan assets:      
Fair value of plan assets at beginning of period 24,159 26,624  
Actual gain (loss) on plan assets 4,392 (2,024)  
Contributions   688  
Effects of foreign currency exchange rate changes (535) (1,129)  
Fair value of plan assets at end of period 28,016 24,159 $ 26,624
Unfunded status at end of period $ (15,886) $ (13,086)