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Schedule of Defined Benefit Pension and Postretirement Benefit Plan Assets and Obligation (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure              
Actuarial loss $ 7,700 $ 2,700 $ 100 $ 7,700   $ (29,000)  
Ending Balance 160,700       $ 160,700    
UNITED STATES              
Defined Benefit Plan Disclosure              
Projected benefit obligation, Beginning of year         203,791 178,237  
Service cost         1,773 1,608 $ 2,196
Interest cost         5,770 7,189 8,940
Actuarial loss         24,671 24,447  
Benefits paid         (9,844) (7,690)  
Retiree annuity purchase         (24,379)    
Liability loss due to settlement         451    
Non-U.S. currency movement         0    
Projected benefit obligation, End of year 202,233     203,791 202,233 203,791 178,237
Beginning Balance         166,932 144,301  
Actual return on plan assets         23,048 27,516  
Company contributions         3,098 2,805  
Benefits paid         (9,844) (7,690)  
Retiree annuity purchase         (24,379)    
Non-U.S. currency movement         0    
Ending Balance 158,855     166,932 158,855 166,932 144,301
Funded status (43,378)     (36,859) (43,378) (36,859)  
Foreign Pension Plans, Defined Benefit              
Defined Benefit Plan Disclosure              
Projected benefit obligation, Beginning of year         43,952 39,146  
Service cost         907 751 786
Interest cost         516 691 687
Actuarial loss         2,951 4,520  
Benefits paid         (1,299) (836)  
Retiree annuity purchase         0    
Liability loss due to settlement         0    
Non-U.S. currency movement         3,961 (320)  
Projected benefit obligation, End of year 50,988     43,952 50,988 43,952 39,146
Beginning Balance         1,586 1,400  
Actual return on plan assets         67 64  
Company contributions         1,079 923  
Benefits paid         (988) (836)  
Retiree annuity purchase         0    
Non-U.S. currency movement         112 35  
Ending Balance 1,856     1,586 1,856 1,586 1,400
Funded status (49,132)     (42,366) (49,132) (42,366)  
Postretirement Benefit Plans              
Defined Benefit Plan Disclosure              
Projected benefit obligation, Beginning of year         9,003 9,256  
Service cost         57 41 39
Interest cost         240 347 196
Actuarial loss         421 717  
Benefits paid         (1,205) (1,358)  
Projected benefit obligation, End of year 8,515     9,003 8,515 9,003 $ 9,256
Beginning Balance         0    
Company contributions         1,205 1,358  
Benefits paid         (1,205) (1,358)  
Ending Balance 0     0 0 0  
Funded status $ (8,515)     $ (9,003) $ (8,515) $ (9,003)