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Retirement Plans - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Participant
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Defined Benefit Plan Disclosure              
Number of retiree participants | Participant         115    
Defined Benefit Plan, decrease in benefit obligation         $ 4,000    
Defined Benefit Plan, decrease in plan assets         24,400    
Actrual loss on benefit obligations $ (7,700) $ (2,700) $ (100) $ (7,700)   $ 29,000  
Gain (Loss) Due to Settlement         (500)    
Fair value of pension plans assets totaled 160,700       160,700    
UNITED STATES              
Defined Benefit Plan Disclosure              
Actrual loss on benefit obligations         (24,671) (24,447)  
Accumulated benefit obligation for defined benefit pension plans $ 196,700     $ 198,200 $ 196,700 $ 198,200  
Percentage of expected return on plan assets assumption         3.00% 4.30% 4.30%
Discount rate utilized to determine future pension obligations 2.20%     3.00% 2.20% 3.00%  
Fair value of pension plans assets totaled $ 158,855     $ 166,932 $ 158,855 $ 166,932 $ 144,301
Contribution to defined benefit pension plans         3,098 2,805  
Foreign Pension Plans, Defined Benefit              
Defined Benefit Plan Disclosure              
Actrual loss on benefit obligations         (2,951) (4,520)  
Accumulated benefit obligation for defined benefit pension plans $ 46,500     $ 39,900 $ 46,500 $ 39,900  
Percentage of expected return on plan assets assumption         3.80% 2.00% 1.50%
Discount rate utilized to determine future pension obligations 0.70%     1.10% 0.70% 1.10%  
Fair value of pension plans assets totaled $ 1,856     $ 1,586 $ 1,856 $ 1,586 $ 1,400
Contribution to defined benefit pension plans         1,079 923  
Postretirement Benefit Plans              
Defined Benefit Plan Disclosure              
Defined Benefit Plan, decrease in benefit obligation         27,600    
Actrual loss on benefit obligations         $ (421) $ (717)  
Discount rate utilized to determine future pension obligations 2.20%     3.00% 2.20% 3.00% 4.00%
Fair value of pension plans assets totaled $ 0     $ 0 $ 0 $ 0  
Contribution to defined benefit pension plans         $ 1,205 $ 1,358  
United States Plans              
Defined Benefit Plan Disclosure              
Percentage of expected return on plan assets assumption         3.00%    
Discount rate utilized to determine future pension obligations 2.30%     3.10% 2.30% 3.10%  
Fair value of pension plans assets totaled $ 158,900       $ 158,900    
U.S. Supplemental Executive Defined Benefit Pension Plan              
Defined Benefit Plan Disclosure              
Contribution to defined benefit pension plans         3,100 $ 2,800  
Contribution to defined benefit pension plans in 2018 3,300       3,300    
Non-United States Subsidiaries              
Defined Benefit Plan Disclosure              
Contribution to defined benefit pension plans         1,100 $ 900  
Contribution to defined benefit pension plans in 2018 1,100       1,100    
Taiwan Defined Benefit Pension Plan              
Defined Benefit Plan Disclosure              
Fair value of pension plans assets totaled $ 1,900       $ 1,900