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Plant Closure Provisions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restructuring Cost and Reserve [Line Items] |  |  |
Expenditure | $ 2.7 | $ 2.6 | $ 2.0
Remediation [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accretion expense recognized | 3.4 |  |
Remediation charge for changes in the scope and cost of future remediation activities | $ 1.3 |  |
Discount rate of remediation provision | 8.92% |  |
Expenditure | $ 2.7 | $ 2.6 | $ 2.0

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