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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |
Federal corporate tax rate |  | 35.00% | 21.00%
Deductibility percentage of certain capital expenditures |  |  | 100.00%
Tax benefit from change in corporate tax rates on deferred tax liabilities |  | $ 61.0 |
Tax rate | 22.00% | 2.00% |

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- Definition Amount of income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act. + References No definition available. + Details
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- Definition Tax cuts and jobs act of 2017 deductibility percentage of certain capital expenditures. + References No definition available. + Details
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