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Long-Term Debt - Additional Information (Detail)			1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 28, 2016 USD ($)	Apr. 13, 2015	Sep. 30, 2016 USD ($) day	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2017 USD ($) day $ / shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 26, 2018 USD ($)	Sep. 25, 2017 USD ($)	Apr. 10, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 15, 2016 USD ($)
Debt Instrument [Line Items]
Long-term debt				$ 2,097,606,000	$ 2,097,606,000	$ 2,297,214,000
Total long-term debt				2,097,606,000	2,097,606,000	2,297,214,000
Less: unamortized deferred financing costs on senior unsecured notes				29,000,000	29,000,000
Aggregate cost of debt repurchased					0	435,907,000	$ 0
Gain (loss) on debt repurchase					0	4,741,000	0
Equity component of senior unsecured convertible notes, net						56,720,000
Amortization of deferred financing costs					7,000,000	9,800,000	7,200,000
Senior unsecured notes
Debt Instrument [Line Items]
Less: unamortized deferred financing costs on senior unsecured notes				22,956,000	22,956,000	28,268,000
Total principal of senior unsecured notes				$ 2,052,950,000	2,052,950,000	$ 2,052,950,000
Debt repurchased	$ 362,400,000
Aggregate cost of debt repurchased	371,400,000				$ 64,500,000
Senior unsecured notes | Minimum
Debt Instrument [Line Items]
Senior unsecured notes stated interest rate (percent)				6.50%	6.50%
Senior unsecured notes | Maximum
Debt Instrument [Line Items]
Senior unsecured notes stated interest rate (percent)				7.25%	7.25%
Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, capacity available for specific purpose other than for trade purchases				$ 2,500,000,000	$ 2,500,000,000
Extension of maturity date condition, retirement or refinancing of note, term		90 days
Debt, weighted average interest rate				3.10%	3.10%	2.50%
Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Line of credit sublimit										$ 1,600,000,000	$ 1,150,000,000
Current borrowing base										$ 1,150,000,000
Debt, weighted average interest rate				3.20%	3.20%
Write off of deferred finance costs					$ 0	$ 1,800,000	500,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value				$ 2,116,700,000	2,116,700,000
Unsecured Senior Notes | Senior unsecured notes
Debt Instrument [Line Items]
Total long-term debt				2,053,000,000	2,053,000,000
7.25% senior unsecured notes due February 1, 2019 | Senior unsecured notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes				$ 54,275,000	$ 54,275,000	54,275,000
Senior unsecured notes stated interest rate (percent)				7.25%	7.25%
Debt repurchased	$ 344,700,000				$ 1,000,000
6.5% senior unsecured notes due November 1, 2021 | Senior unsecured notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes				$ 395,501,000	395,501,000	395,501,000
Senior unsecured notes stated interest rate (percent)	6.50%
Debt repurchased	$ 2,200,000				2,300,000
Amended credit facility
Debt Instrument [Line Items]
Long-term line of credit				70,000,000	70,000,000
Outstanding letters of credit				10,500,000	10,500,000
Letter of credit unused borrowing base capacity				1,069,500,000	$ 1,069,500,000
Amended credit facility | Current ratio
Debt Instrument [Line Items]
Minimum current ratio					1.0
Aggregate elected commitment threshold				1,350,000,000.0	$ 1,350,000,000.0
Amended credit facility | Minimum | EBITDAX
Debt Instrument [Line Items]
Minimum debt to EBITDAX ratio					2.5
The Credit Agreement [Member] | Bridge Loan [Member]
Debt Instrument [Line Items]
Line of credit sublimit									$ 10,000,000
OMP Credit Facility
Debt Instrument [Line Items]
Long-term line of credit				78,000,000	$ 78,000,000
OMP Credit Facility | Revolving credit facility
Debt Instrument [Line Items]
Less: unamortized deferred financing costs on senior unsecured notes				2,000,000	2,000,000
OMP Credit Facility | Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Total principal of senior unsecured notes						0
Notes [Member] | Senior unsecured notes
Debt Instrument [Line Items]
Unsecured Debt				1,753,000,000	1,753,000,000
6.875% senior unsecured notes due March 15, 2022 | Senior unsecured notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes				937,080,000	937,080,000	937,080,000
Senior unsecured notes stated interest rate (percent)	6.875%
Debt repurchased	$ 3,400,000				59,500,000
6.875% senior unsecured notes due January 15, 2023 | Senior unsecured notes
Debt Instrument [Line Items]
Total principal of senior unsecured notes				366,094,000	366,094,000	366,094,000
Senior unsecured notes stated interest rate (percent)	6.875%
Debt repurchased	$ 12,100,000				21,800,000
Purchased Notes [Member] | Senior unsecured notes
Debt Instrument [Line Items]
Debt repurchased					84,600,000
Gain (loss) on debt repurchase					4,700,000
2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes
Debt Instrument [Line Items]
Debt discount at inception				80,388,000	80,388,000	90,468,000						$ 93,200,000
Total principal of senior unsecured notes				$ 300,000,000	$ 300,000,000	300,000,000
Senior unsecured notes stated interest rate (percent)			2.625%
Senior unsecured debt principal amount			$ 300,000,000
Proceeds from debt issuance, net of issuance costs			$ 291,900,000
Initial conversion rate (shares per $1000 principal)					76.3650
Debt conversion rate | $ / shares				$ 13.10	$ 13.10
Effective interest rate (percent)												8.97%
Estimate of fair value of debt at issuance												$ 206,800,000
2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes | Long-term debt
Debt Instrument [Line Items]
Liability component of issuance costs				$ 5,400,000	$ 5,400,000
2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes | Additional Paid-in-Capital
Debt Instrument [Line Items]
Equity component of senior unsecured convertible notes, net					2,400,000
Oasis Credit Facility | Revolving credit facility
Debt Instrument [Line Items]
Less: unamortized deferred financing costs on senior unsecured notes				$ 4,000,000	4,000,000
Gain on Extinguishment of Debt | Purchased Notes [Member] | Senior unsecured notes
Debt Instrument [Line Items]
Write off of deferred finance costs					$ 0	$ 6,400,000	$ 0
Debt Conversion Scenario 1 | Amended credit facility | Current ratio
Debt Instrument [Line Items]
EBITDAX ratio					4.25
Debt Conversion Scenario 1 | 2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes
Debt Instrument [Line Items]
Number of trading days | day			20
Number of consecutive trading days | day			30
Conversion price, percentage of stock price trigger (percent)			130.00%
Debt Conversion Scenario 2 | Amended credit facility | Current ratio
Debt Instrument [Line Items]
EBITDAX ratio					4.0
Debt Conversion Scenario 2 | 2.625% senior unsecured convertible notes due September 15, 2023 | Senior unsecured notes
Debt Instrument [Line Items]
Number of trading days | day			5
Number of consecutive trading days | day					5
Percentage of stock price to product of stock sale price and conversion rate (percent)					98.00%
LIBOR | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Loan term					1 month
Commitment fee of borrowing base capacity not utilized, percentage				0.375%
LIBOR | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Loan term					6 months
Commitment fee of borrowing base capacity not utilized, percentage				0.50%
OMP Operating, LLC [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Line of credit sublimit									10,000,000
OMP Operating, LLC [Member] | Revolving credit facility
Debt Instrument [Line Items]
Line of credit sublimit									200,000,000
Line of credit, sublimit increase allowed subject to certain conditions									$ 400,000,000
OMP Operating, LLC [Member] | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Commitment fee of borrowing base capacity not utilized, percentage					0.375%
OMP Operating, LLC [Member] | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Commitment fee of borrowing base capacity not utilized, percentage					0.50%
OMP Operating, LLC [Member] | Federal Funds Effective Swap Rate [Member] | ABR Loans [Member] | Revolving credit facility
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					0.50%
OMP Operating, LLC [Member] | Federal Funds Effective Swap Rate [Member] | ABR Loans or Swingline Loans [Member] | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					0.75%
OMP Operating, LLC [Member] | Federal Funds Effective Swap Rate [Member] | ABR Loans or Swingline Loans [Member] | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					1.75%
OMP Operating, LLC [Member] | LIBOR | ABR Loans [Member] | Revolving credit facility
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					1.00%
OMP Operating, LLC [Member] | LIBOR | Eurodollar Loans [Member] | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					1.75%
OMP Operating, LLC [Member] | LIBOR | Eurodollar Loans [Member] | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					2.75%
OMP Operating, LLC [Member] | LIBOR | ABR Loans or Swingline Loans [Member] | Revolving credit facility | Minimum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					0.75%
OMP Operating, LLC [Member] | LIBOR | ABR Loans or Swingline Loans [Member] | Revolving credit facility | Maximum
Debt Instrument [Line Items]
Applicable margin on variable rate (percent)					1.75%
Subsequent Event | Line of credit | Revolving credit facility
Debt Instrument [Line Items]
Current borrowing base								$ 1,350,000,000

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Gross amount of debt extinguished.

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No definition available.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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No definition available.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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