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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%

X

- 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

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- Definition

Tax cuts and jobs act of 2017 deductibility percentage of certain capital expenditures.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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