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Income Taxes - Additional Information (Detail)	6 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal corporate tax rate			21.00%	35.00%
Deductibility percentage of certain capital expenditures			100.00%
Tax rate	21.00%	31.00%

X

- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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-SubTopic 10
-Section 50
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