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Income Taxes - Summary of Differences Between Total Income Tax Expense Statutory Federal Income Tax Rate (Parenthetical) (Detail) - TRS [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense Benefit [Line Items] |  |
Deferred tax impact of federal rate change |  | $ 19.4
Deferred tax impact of state tax rate change | $ 7.4 |

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- Definition Amount of overall deferred tax impact of federal rate change. + References No definition available. + Details
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- Definition Deferred tax impact of state tax rate change. + References No definition available. + Details
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- Definition Income tax expense benefit. + References No definition available. + Details
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- Details
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