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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Taxes [Line Items]        
Effective income tax rate 20.90% 34.90% 22.90% 28.80%
Phosphorous Flame Retardant Business Exit
       
Income Taxes [Line Items]        
Restructuring charges   $ 94.7   $ 94.7
Restructuring charges, net of tax   $ 73.6   $ 73.6