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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Pension Plan | U.S.    
Net periodic benefit cost    
Service cost $ 87 $ 86
Interest cost 333 356
Expected return on plan assets (445) (433)
Net amortization/deferrals 243 248
Net periodic benefit cost (credit) $ 218 $ 257
Assumptions    
Discount Rate (as a percent) 3.56% 3.95%
Expected long-term rate of return (as a percent) 5.15% 4.95%
Rate of compensation increase (as a percent) 3.00% 3.00%
Pension Plan | International    
Net periodic benefit cost    
Service cost $ 691 $ 614
Interest cost 1,834 1,677
Expected return on plan assets (3,466) (2,910)
Net amortization/deferrals 554 685
Net periodic benefit cost (credit) $ (387) $ 66
Assumptions    
Discount Rate (as a percent) 2.40% 2.51%
Expected long-term rate of return (as a percent) 5.10% 4.93%
Rate of compensation increase (as a percent) 2.60% 2.54%
Other Postretirement Benefit Plan | U.S.    
Net periodic benefit cost    
Service cost $ 1 $ 1
Interest cost 81 88
Net amortization/deferrals (76) (73)
Net periodic benefit cost (credit) $ 6 $ 16
Assumptions    
Discount Rate (as a percent) 3.43% 3.76%
Other Postretirement Benefit Plan | International    
Net periodic benefit cost    
Service cost $ 8 $ 7
Interest cost 26 24
Net amortization/deferrals (4) (7)
Net periodic benefit cost (credit) $ 30 $ 24
Assumptions    
Discount Rate (as a percent) 3.21% 3.46%