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Plant Closure Provisions - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]      
Remediation charge for changes in the scope and cost of future remediation activities $ 0.2 $ 0.2 $ 0.6
Expenditure 2.0 2.7 3.8
Severance [Member]
      
Restructuring Cost and Reserve [Line Items]      
Number of reporting segment 3    
Expenditure 0.1 0.6 0.7
Remediation [Member]
      
Restructuring Cost and Reserve [Line Items]      
Accretion expense recognized 2.6    
Remediation charge for changes in the scope and cost of future remediation activities 1.3    
Discount rate of remediation provision 8.92%    
Expenditure $ 1.9 $ 2.1 $ 3.1