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Supplementary Data to Statements of Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Foreign currency translation income (expense) $ 0.3 $ 2.8
Net periodic benefit expense, excluding service cost $ 1.3 $ 0.6