Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Income Tax [Line Items]
Reduction in income tax provision	$ 3.7
Unrecognized tax benefits related to federal, state and foreign taxes	48.7	43.4
Unrecognized tax benefits that would impact effective tax rate	41.0
Accrued interest	5.8	4.8
Decrease in unrecognized tax benefits	$ 18.4
Number of months unrecognized tax benefits may decrease	12 months

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Number Of Months Unrecognized Tax Benefits May Potentially Decrease

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The estimated upper bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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- Definition

Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

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Amount of interest expense accrued for an underpayment of income taxes.

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- Definition

The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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