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Accounting for Uncertainty in Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012 Year	Dec. 31, 2011
Deferred Tax Liability Not Recognized [Line Items]
Unrecognized tax benefits that, if recognized, would affect the effective tax rate	$ 20.0	$ 19.2
Number of tax years the company is currently open to audit by tax authorities	5
Maximum
Deferred Tax Liability Not Recognized [Line Items]
Liability for unrecognized tax benefits for interest and penalties	$ 1.0	$ 1.0

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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