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Accounting for Uncertainty in Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Liability for unrecognized tax	$ 10.0		$ 15.7
Unrecognized tax favorable impact on effective tax rate	3.2		8.6
Accrued interest and penalties applied to uncertain tax positions	$ 7.3	$ 7.0

This element represents the total of interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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