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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |  |
Income tax effective rate | 53.80% |  | 45.30% | 51.20% | 76.40% |
Income tax expense (benefit) impact of the tax act | $ (0.5) | $ 8.3 |  | $ (0.5) |  |
Minimum [Member] |  |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |  |
Decrease in unrecognized tax benefits |  |  |  |  |  | $ 2.1
Maximum [Member] |  |  |  |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |  |  |  |
Decrease in unrecognized tax benefits |  |  |  |  |  | $ 4.1

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