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Income Taxes -Additional Information (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Income Tax Disclosure [Abstract] |
Decrease of deferred tax assets | $ 301.0
Decrease in valuation allowance | 301.0
Additional income tax expense or benefit | 0.0
Provisional amount recorded related to mandatory deemed repatriation of foreign earnings | $ 0.0

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