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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Pension Plan | U.S.    
Net periodic benefit cost    
Service cost $ 71 $ 87
Interest cost 372 333
Expected return on plan assets (433) (445)
Net amortization/deferrals 207 243
Net periodic benefit cost (credit) $ 217 $ 218
Assumptions    
Discount Rate (as a percent) 4.30% 3.56%
Expected long-term rate of return (as a percent) 5.35% 5.15%
Rate of compensation increase (as a percent) 3.00% 3.00%
Pension Plan | International    
Net periodic benefit cost    
Service cost $ 611 $ 691
Interest cost 1,711 1,834
Expected return on plan assets (2,927) (3,466)
Net amortization/deferrals 641 554
Net periodic benefit cost (credit) $ 36 $ (387)
Assumptions    
Discount Rate (as a percent) 2.53% 2.40%
Expected long-term rate of return (as a percent) 5.01% 5.10%
Rate of compensation increase (as a percent) 2.60% 2.60%
Other Postretirement Benefit Plan | U.S.    
Net periodic benefit cost    
Service cost $ 1 $ 1
Interest cost 89 81
Net amortization/deferrals (101) (76)
Net periodic benefit cost (credit) $ (11) $ 6
Assumptions    
Discount Rate (as a percent) 4.17% 3.43%
Other Postretirement Benefit Plan | International    
Net periodic benefit cost    
Service cost $ 2 $ 8
Interest cost 20 26
Net amortization/deferrals (22) (4)
Net periodic benefit cost (credit) $ 0 $ 30
Assumptions    
Discount Rate (as a percent) 3.49% 3.21%