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Schedule of Net Periodic Pension and Postretirement (income) Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure      
Net actuarial (gain) loss $ (3,316) $ (6,624) $ (3,203)
UNITED STATES      
Defined Benefit Plan Disclosure      
Service cost 2,196 2,239 2,302
Interest cost 8,940 13,151 13,630
Expected return on plan assets (9,049) (12,008) (13,830)
Amortization of prior service cost 58 70 96
Net actuarial (gain) loss (4,429) (6,712) (4,013)
Settlement loss 345    
Total net periodic pension (income) cost (1,939) (3,260) (1,815)
Prior service cost (58) (70) (96)
Total recognized in other comprehensive income (58) (70) (96)
Total recognized in net periodic postretirement benefit cost (income) and other comprehensive income (1,997) (3,330) (1,911)
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Service cost 786 818 761
Interest cost 687 852 1,185
Expected return on plan assets (19) (165) (443)
Amortization of prior service cost    
Net actuarial (gain) loss 743 (310) 815
Settlement loss    
Total net periodic pension (income) cost 2,197 1,195 2,318
Prior service cost    
Total recognized in other comprehensive income    
Total recognized in net periodic postretirement benefit cost (income) and other comprehensive income 2,197 1,195 2,318
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Service cost 39 34 37
Interest cost 196 201 218
Amortization of prior service cost (373) (496) (607)
Net actuarial (gain) loss 25 398 5
Special termination benefits 3,708 591  
Total net periodic pension (income) cost 3,595 728 (347)
Prior service cost   (93)
Prior service credit 373 496 607
Total recognized in other comprehensive income 373 496 514
Total recognized in net periodic postretirement benefit cost (income) and other comprehensive income $ 3,968 $ 1,224 $ 167