Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax [Line Items]
Effective income tax rate	24.30%	19.20%
Income tax examination, increase (decrease) in liability from prior year		$ 10.9
Unrecognized tax benefits related to federal, state and foreign taxes	36.1us-gaap_UnrecognizedTaxBenefits		36.1us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate	30.8
Accrued interest	3.2		2.9
Decrease in unrecognized tax benefits within the next 12 months	$ 11.8
Number of months unrecognized tax benefits may decrease	12 months

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Number of months unrecognized tax benefits may decrease.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section S99

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-Subparagraph (SX 210.4-08.(h)(2))

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-Publisher SEC

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-Number 210

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- Definition

The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period.

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Amount of (increase) decrease reasonably possible in the estimated upper bound of the unrecognized tax benefit for a tax position taken or expected to be taken.

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

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-Glossary Unrecognized Tax Benefit

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

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

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