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Retirement Plans and Other Postretirement Benefits - Accumulated Benefit Obligation ("ABO") (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
U.S. Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation $ 520,161 $ 498,969
U.S. Defined Benefit Pension Plans | Funded plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 515,667 493,756
U.S. Defined Benefit Pension Plans | Unfunded plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 4,494 5,213
Foreign Defined Benefit Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 349,088 309,990
Foreign Defined Benefit Pension Plans | Funded plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation 295,998 264,675
Foreign Defined Benefit Pension Plans | Unfunded plans    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated benefit obligation $ 53,090 $ 45,315