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Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure      
Total $ 145,700    
Group Annuity Insurance Contracts | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total $ 3,166 $ 29,456
UNITED STATES      
Defined Benefit Plan Disclosure      
Total 144,301 324,506 307,304
UNITED STATES | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 1,449 3,217  
UNITED STATES | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 142,852 318,123  
UNITED STATES | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total   3,166  
UNITED STATES | Corporate Debt Securities      
Defined Benefit Plan Disclosure      
Total 115,424 260,294  
UNITED STATES | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 115,424 260,294  
UNITED STATES | US Government Debt Securities      
Defined Benefit Plan Disclosure      
Total 20,176 25,709  
UNITED STATES | US Government Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 20,176 25,709  
UNITED STATES | Global equity Securities      
Defined Benefit Plan Disclosure      
Total 7,252 32,120  
UNITED STATES | Global equity Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 7,252 32,120  
UNITED STATES | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Total 1,449 3,217  
UNITED STATES | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 1,449 3,217  
UNITED STATES | Group Annuity Insurance Contracts      
Defined Benefit Plan Disclosure      
Total   3,166  
UNITED STATES | Group Annuity Insurance Contracts | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total   3,166  
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Total 1,400 1,307 $ 27,571
Foreign Pension Plans, Defined Benefit | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 1,400 1,307  
Foreign Pension Plans, Defined Benefit | Other      
Defined Benefit Plan Disclosure      
Total 1,400 1,307  
Foreign Pension Plans, Defined Benefit | Other | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total $ 1,400 $ 1,307