Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Line Items]
Effective tax rate for income from continuing operations	37.50%	24.40%	35.10%	24.60%
Recognized Discrete Tax Benefits	$ 0.5		$ 0.5
Foreign Tax Credits [Member]
Income Taxes [Line Items]
Tax Credit Carry Forward Reversal Of Valuation Allowance	$ 0.5		$ 2.6