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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Federal statutory rate | 21.00% | 35.00%
Net operating losses, state | $ 65.3 |
Net operating losses expiration date | 2038 |
Income tax expense benefit due to change in tax rate | $ 59.7 |

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- Definition Tax Cuts and Jobs Act of 2017, incomplete accounting, change in tax rate, deferred tax liability, provisional income tax benefit. + References No definition available. + Details
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