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Retirement Plans and Other Postretirement Benefits - Fair Value of Plan Assets for Foreign Defined Benefit Pension Plans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 913,034 $ 845,979  
Foreign Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 250,735 224,347  
Foreign Defined Benefit Pension Plans | Life insurance      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,908 19,298  
Foreign Defined Benefit Pension Plans | Total investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,908 19,298  
Foreign Defined Benefit Pension Plans | Investments measured at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 229,827 205,049  
Level 3 | Foreign Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,908 19,298  
Level 3 | Foreign Defined Benefit Pension Plans | Life insurance      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20,908 19,298 $ 18,685
Level 3 | Foreign Defined Benefit Pension Plans | Total investments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 20,908 $ 19,298