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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Commitments And Contingencies [Line Items]      
Loss contingency accrual   $ 0.0 $ 0.0
Pension Benefits [Member] | US Plan [Member]      
Schedule Of Commitments And Contingencies [Line Items]      
Final contribution to fund benefit obligation $ 1.1    
Settlement of remaining benefit obligation 18.7    
Additional settlement loss $ 5.1