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Schedule of Fair Value of Pensions Plan Assets by Asset Category (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Total $ 160,700    
UNITED STATES      
Defined Benefit Plan Disclosure      
Total 158,855 $ 166,932 $ 144,301
UNITED STATES | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 1,582 1,610  
UNITED STATES | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 157,273 165,322  
UNITED STATES | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Corporate Debt Securities      
Defined Benefit Plan Disclosure      
Total 127,098 133,792  
UNITED STATES | Corporate Debt Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 127,098 133,792  
UNITED STATES | Corporate Debt Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | US Government Debt Securities      
Defined Benefit Plan Disclosure      
Total 22,250 23,186  
UNITED STATES | US Government Debt Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | US Government Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 22,250 23,186  
UNITED STATES | US Government Debt Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Global equity Securities      
Defined Benefit Plan Disclosure      
Total 7,925 8,344  
UNITED STATES | Global equity Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Global equity Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 7,925 8,344  
UNITED STATES | Global equity Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Other      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Other | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Other | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Other | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Total 1,582 1,610  
UNITED STATES | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 1,582 1,610  
UNITED STATES | Cash and Cash Equivalents | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
UNITED STATES | Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure      
Total 1,856 1,586 $ 1,400
Foreign Pension Plans, Defined Benefit | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 1,856 1,586  
Foreign Pension Plans, Defined Benefit | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Corporate Debt Securities      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Corporate Debt Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Corporate Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Corporate Debt Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | US Government Debt Securities      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | US Government Debt Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | US Government Debt Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | US Government Debt Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Global equity Securities      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Global equity Securities | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Global equity Securities | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Global equity Securities | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Other      
Defined Benefit Plan Disclosure      
Total 1,856 1,586  
Foreign Pension Plans, Defined Benefit | Other | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Other | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 1,856 $ 1,586  
Foreign Pension Plans, Defined Benefit | Other | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Instruments (Level 1)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure      
Total 0    
Foreign Pension Plans, Defined Benefit | Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure      
Total $ 0