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Earnings (Loss) Per Share - Schedule of Weighted-Average Number of Shares Outstanding (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Adjustments to net income (loss) attributable to Oasis available to common stockholders	$ 0	$ 0	$ 0
Basic weighted average common shares outstanding (in shares)	315,002,000	307,480,000	234,986,000
Diluted weighted average common shares outstanding (in shares)	315,002,000	307,480,000	237,875,000
Restricted stock awards and PSUs
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Dilutive effect of restricted stock awards and PSUs (shares)	0	0	2,889,000

X

- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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