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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate, rate	35.00%	35.00%
Unrecognized income tax benefits	$ 7.5		$ 7.1
Recognized additional liabilities	$ 0.4	$ 0.4

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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