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Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure      
Deferred taxes $ (20,025) $ (12,881) $ (9,398)
Total recognized in other comprehensive income, net of tax    
UNITED STATES      
Defined Benefit Plan Disclosure      
Prior service cost, before tax 58  
Deferred taxes 560 539  
Total recognized in other comprehensive income, net of tax 560 597  
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Prior service cost, before tax    
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure      
Prior service cost, before tax (249) (622)  
Deferred taxes (1,641) (1,472)  
Total recognized in other comprehensive income, net of tax $ (1,890) $ (2,094)