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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Income Tax [Line Items] |  |  |  |  |
Net deferred income tax assets | $ 47.2 |  | $ 47.2 |  | $ 48.0
Reduction in valuation allowance | 0.8 |  |  |  |
Income tax rate non deductible legal settlement | $ 2.4 |  | $ 2.4 |  |
Effective tax rate increased | 132.50% |  | 7.10% |  |
Decrease in effective tax rate |  | 2.10% |  | 6.70% |
Decrease in unrecognized tax positions | $ 1.5 |  | $ 1.5 |  |
Interest and penalties | 1.6 |  | 1.6 |  |
Florida [Member] |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Increase in tax expense (benefit) | $ (0.5) |  | $ (0.5) |  |
Decrease in effective tax rate due to settlement of a state income tax audit, percentage | (28.20%) |  | (1.50%) |  |

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