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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2013 Scenario, Forecast [Member]
Income Taxes [Line Items]
Income tax expense at federal statutory rate, rate	35.00%	35.00%
Unrecognized income tax benefits	$ 8.0		$ 8.0		$ 7.1
Recognized additional liabilities	$ 0.2	$ 1.2	$ 0.9	$ 1.9
Estimated Effective tax rate	26.90%	27.80%				29.10%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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