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Leases, User Charges and Commitments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Containers
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Lease and Rental Expense [Line Items]        
Rental expense   $ 10.1 $ 8.8 $ 9.9
Rail transportation charges   69.1 67.0 64.0
Number of containers to be purchased at lease expiration date 2,000      
Total price of containers to be purchased at lease expiration date 7.8      
Leases expiry date 2014      
Transportation Costs [Member]
        
Lease and Rental Expense [Line Items]        
Rental expense   $ 10.2 $ 9.3 $ 9.4