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Equity-Based Compensation - Additional Information (Detail)				12 Months Ended
	Jan. 01, 2019 shares	Oct. 19, 2017	May 22, 2017	Dec. 31, 2018 USD ($) day $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares) | shares				16,050,000
Stock-based compensation expense				$ 29,273,000	$ 26,534,000	$ 24,103,000
Associated tax benefit				$ 6,800,000	6,300,000	8,300,000
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Stock-based compensation expense				$ 20,100,000	19,500,000	20,000,000
Fair value of awards vested				$ 17,300,000	$ 22,000,000	$ 6,900,000
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 10.20	$ 15.03	$ 5.63
Unrecognized expense				$ 34,200,000
Unrecognized expense recognition period				1 year 11 months 15 days
PSUs that vested in period (shares) | shares				1,826,855
Performance share unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 8,500,000	$ 6,700,000	$ 4,200,000
Fair value of awards vested				$ 5,300,000		$ 1,000,000
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 12.71	$ 16.89	$ 3.00
Unrecognized expense				$ 10,000,000
Unrecognized expense recognition period				2 years 9 months 18 days
Right to received shares of common stock | shares				1
PSUs that vested in period (shares) | shares				564,068	0
Number of trading days | day				30
Performance share unit awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSU granted percentage of earnings				0.00%
Performance share unit awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PSU granted percentage of earnings				200.00%
Restricted unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 17.55
Unrecognized expense				$ 100,000
Unrecognized expense recognition period				5 months 5 days
PSUs that vested in period (shares) | shares				11,766
Phantom units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 23.91
PSUs that vested in period (shares) | shares				29,254
OMP | Restricted unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 400,000	$ 100,000
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares					$ 17.00
Vesting period			10 years
Oasis Midstream Partners, LP | Restricted unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of awards vested				300,000
Oasis Midstream Partners, LP | Phantom units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				500,000	$ 100,000
Fair value of awards vested				$ 600,000	$ 0	$ 0
Weighted average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 16.40	$ 16.40
OMP LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common units reserved for future issuance | shares				2,117,618
Long Term Incentive Plan (LTIP) | Restricted unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				1 year
Long Term Incentive Plan (LTIP) | Oasis Midstream Partners, LP | Phantom units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized expense recognition period				2 years 4 months 2 days
Vesting period		3 years
Unrecognized compensation cost				$ 2,100,000
Subsequent Event | OMP LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | shares	337,790

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Percentage Of Performance Share Awards Based On Shareholder Return

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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