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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |
Federal statutory income tax rate, percent | 21.00% | 35.00%
Tax Cuts and Jobs Act, Change in tax rate, Provisional income tax expense (benefit) |  | $ 104.9
Minimum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Income tax examinations year under examination | 2014 |
Minimum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Income tax examinations year under examination | 2015 |
Maximum [Member] | State and Local Jurisdiction [Member] |  |
Income Tax Examination [Line Items] |  |
Income tax examinations year under examination | 2018 |
Maximum [Member] | Internal Revenue Service (IRS) [Member] |  |
Income Tax Examination [Line Items] |  |
Income tax examinations year under examination | 2018 |

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- Definition Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act for which accounting for tax effect. + References No definition available. + Details
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