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Postretirement Benefits Other Than Pensions - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement charges $ (184) $ (15,997) $ (775)
Other Postretirement Benefits Plan [Member]      
Payment for Pension and Other Postretirement Benefits [Abstract]      
Other post retirement benefits recorded in consolidated balance sheets 1,778 4,454  
UNITED STATES      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement charges   3,452  
Payment for Pension and Other Postretirement Benefits [Abstract]      
Unrecognized prior service credits 0 (55)  
Unrecognized actuarial gains, before tax (11,018) (14,496)  
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Pension settlement charges   (453)  
Payment for Pension and Other Postretirement Benefits [Abstract]      
Unrecognized prior service credits 0 (93)  
Unrecognized actuarial gains, before tax $ 9,563 $ 7,753