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Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - VENEZUELA - Compensatory Purposes [Member]
$ in Millions
 1 Months Ended 6 Months Ended 9 Months Ended
Dec. 27, 2016
USD ($)
Mar. 13, 2015
USD ($)
Jun. 30, 2018
USD ($)
Subsidiary
Dec. 31, 2017
USD ($)
Significant Purchase And Supply Commitment [Line Items]        
"Number of subsidiaries awarded grant | Subsidiary"     2 2,000,000
Compensation awarded to the claimants $ 36.4 $ 46.4 $ 56.9 $ 56.1
Litigation settlement reduction amount $ 10.0      
Litigation Settlement Interest Percentage Of Interest 4.50%      
Litigation settlement accrual interest     $ 0.6  
Net Interest Settlements        
Significant Purchase And Supply Commitment [Line Items]        
Compensation awarded to the claimants       $ 17.1
Legal And Other Settlements [Member]        
Significant Purchase And Supply Commitment [Line Items]        
Compensation awarded to the claimants $ 2.5