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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

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