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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011
Income Tax Contingency [Line Items]
Effective tax rate includes favorable tax adjustment	$ 2.6	$ 4.6	$ 1.6
Reduction of tax adjustments related		4.30%	0.70%
Decrease in unrecognized tax positions	1.7
Possible interest and accrued penalties	$ 3.6	$ 3.6

This element represents the total of accruals as of the date of the statement of financial position for interest 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 for a tax position claimed or expected to be claimed by the entity, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.

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