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Retirement Plans and Other Postretirement Benefits - Summary of Changes of Fair Value of Foreign Plans' Investments Using Significant Unobservable Inputs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at the beginning of the year $ 845,979  
Actual return on assets:    
Fair value of plan assets at the end of the year 913,034 $ 845,979
Foreign Defined Benefit Pension Plans    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at the beginning of the year 224,347  
Actual return on assets:    
Fair value of plan assets at the end of the year 250,735 224,347
Foreign Defined Benefit Pension Plans | Life insurance    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at the beginning of the year 19,298  
Actual return on assets:    
Fair value of plan assets at the end of the year 20,908 19,298
Level 3 | Foreign Defined Benefit Pension Plans    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at the beginning of the year 19,298  
Actual return on assets:    
Fair value of plan assets at the end of the year 20,908 19,298
Level 3 | Foreign Defined Benefit Pension Plans | Life insurance    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Fair value of plan assets at the beginning of the year 19,298 18,685
Actual return on assets:    
Unrealized losses relating to instruments still held at the end of the year 1,610 613
Realized gains (losses) relating to assets sold during the year 0 0
Purchases, sales, issuances and settlements, net 0 0
Fair value of plan assets at the end of the year $ 20,908 $ 19,298