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Retirement Plans and Other Postretirement Benefits - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Percentage of minimum employee contributions 20.00%    
Percentage of maximum employee contributions 100.00%    
Percentage of employee contributions for eligible compensation, Minimum 1.00%    
Percentage of employee contributions for eligible compensation, Maximum 8.00%    
Defined benefit plan contributions by employer employee match $ 1,200    
Market share of treasury stock held (in shares) 384,788 384,788  
Market value of treasury stock held $ 46,500,000 $ 38,400,000  
Percentage of equity securities in company common stock included in plan assets 7.00% 6.20%  
Estimated future benefit payments, 2021 $ 43,200,000    
Estimated future benefit payments, 2022 43,100,000    
Estimated future benefit payments, 2023 44,200,000    
Estimated future benefit payments, 2024 44,600,000    
Estimated future benefit payments, 2025 44,300,000    
Estimated future benefit payments, 2026-2030 220,900,000    
Amount deferred under the compensation plan, including income earned 25,100,000 $ 19,000,000.0  
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan estimated future employer contributions in next fiscal year 6,000,000    
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan estimated future employer contributions in next fiscal year $ 10,000,000    
U.S. Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term return on plan assets 7.00% 7.50% 7.50%
Assumed rate of return next year 6.75%    
U.S. Defined Benefit Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 50.00%    
U.S. Defined Benefit Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 20.00%    
U.S. Defined Benefit Pension Plans | Other Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 30.00%    
Foreign Defined Benefit Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term return on plan assets 5.97% 6.52% 6.52%
Assumed rate of return next year 5.47%    
Foreign Defined Benefit Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 22.00%    
Foreign Defined Benefit Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 21.00%    
Foreign Defined Benefit Pension Plans | Other Securities      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 6.00%    
Foreign Defined Benefit Pension Plans | Multi Asset Funds      
Defined Benefit Plan Disclosure [Line Items]      
Target allocations for the U.S. and foreign benefits plans 51.00%