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Activity in Recorded Workforce Reduction Liabilities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012 Phosphorous Flame Retardant Business Exit	Dec. 31, 2010 Bergheim, Germany Site
Restructuring And Other [Line Items]
Workforce reduction charges	$ 1.9	$ 21.6	$ 6.6
Expected payment under restructuring plan due date			2014

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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