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Income Taxes - Summary of Information Related to Interest and Penalties on Uncertain Tax Positions (Detail) - USD ($) $ in Millions | 9 Months Ended |
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Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Interest expense (income) | $ 0.3 | $ 0.3 |
Accrued interest payable | $ 1.1 |  | $ 0.8

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