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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
Dec. 31, 2019
USD ($)
employee
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
Reserves for pending legal disputes, including commercial disputes and other matters $ 14.0 $ 11.0
Environmental reserves $ 9.3 $ 9.0
Loss Contingencies [Line Items]    
Percentage of employees that are members of trade union and employed under labor agreements 50.00%  
Unionized workforce subject to labor agreement expiring in 2019    
Loss Contingencies [Line Items]    
Percentage of employees that are members of trade union and employed under labor agreements 88.00%  
Number of employees | employee 81,500  
Unionized workforce subject to labor agreement expiring in 2019 | United States and Canada    
Loss Contingencies [Line Items]    
Percentage of employees that are members of trade union and employed under labor agreements 2.00%