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Quarterly Results of Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Quarterly Financial Information [Line Items]        
Pre-tax insurance settlement gain     $ 1.5 $ 2.6
Insurance Claims Related to Property Damage        
Schedule Of Quarterly Financial Information [Line Items]        
Pre-tax insurance settlement gain $ 1.5 $ 2.6    
Germany        
Schedule Of Quarterly Financial Information [Line Items]        
Non-cash deferred income tax expense   5.5    
Income tax benefit   $ 3.0