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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period $ 30,011 $ 26,851  
Service cost 1,260 1,211 $ 1,314
Interest cost 607 720 615
Actuarial (gain) loss - experience 47 (431)  
Actuarial (gain) loss - assumptions (1,294) 2,628  
Benefit payments (80) (52)  
Effects of foreign currency exchange rate changes 4,342 (916)  
Projected benefit obligation at end of period 34,893 30,011 26,851
Change in plan assets:      
Fair value of plan assets at beginning of period 20,045 19,213  
Actual return on plan assets 709 1,494  
Contributions 3,001    
Effects of foreign currency exchange rate changes 2,869 (662)  
Fair value of plan assets at end of period 26,624 20,045 $ 19,213
Funded (unfunded) status at end of period $ (8,269) $ (9,966)