Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Amount of tax benefit recognized	50.00%
Uncertain tax positions	$ 0us-gaap_UnrecognizedTaxBenefits	$ 0us-gaap_UnrecognizedTaxBenefits
Undistributed earnings of the Company's foreign subsidiaries	671
Research and Development credit			1.2
Income taxes paid	$ 69.9us-gaap_IncomeTaxesPaid	$ 41.0us-gaap_IncomeTaxesPaid	$ 37.9us-gaap_IncomeTaxesPaid

Income Tax Benefit Recognition Percentage Of Likelihood Of Being Realized Upon Settlement

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

+ References

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-Publisher FASB

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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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 nondeductible research and development expense.

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- Definition

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

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