Debt Instrument, Convertible, Threshold Percentage of Stock Price to Product of Stock Sale Price and Conversion Rate

No definition available.

Name:	oas_DebtInstrumentConvertibleThresholdPercentageofStockPricetoProductofStockSalePriceandConversionRate
Namespace Prefix:	oas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Maximum Borrowing Capacity, Accordian Feature

+ References

No definition available.

+ Details

Name:	oas_LineofCreditFacilityMaximumBorrowingCapacityAccordianFeature
Namespace Prefix:	oas_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Ownership percentage, guarantor

+ References

No definition available.

+ Details

Name:	oas_OwnershipPercentageGuarantor
Namespace Prefix:	oas_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The price per share of the conversion feature embedded in the debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031898-161870

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdConsecutiveTradingDays1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

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-Topic 835
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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).

+ References

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+ Details

Name:	us-gaap_UnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_DebtInstrumentAxis=oas_UnsecuredSeniorNotesMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oas_AmendedCreditFacilityMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_BridgeLoanMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=oas_TheCreditAgreementMember
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Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
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Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
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Period Type:

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Name:	us-gaap_DebtInstrumentAxis=oas_SeniorSecuredRevolvingLineofCreditMember
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Name:	us-gaap_DebtInstrumentAxis=oas_OMPRevolvingLineofCreditMember
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
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Name:	us-gaap_DebtInstrumentAxis=oas_NotesMember
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- Details

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Name:	srt_RangeAxis=srt_MaximumMember
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- Details

Name:	us-gaap_DebtInstrumentAxis=oas_A2.625PercentSeniorNotesDueSeptember2023Member
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Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
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- Details

Name:	dei_LegalEntityAxis=oas_OMPOperatingLLCMember
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Long-Term Debt - Additional Information (Details)	3 Months Ended
Long-Term Debt - Additional Information (Details)	Mar. 31, 2019 USD ($) day $ / shares	May 06, 2019 USD ($)	Apr. 15, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Total long-term debt	$ 2,791,333,000			$ 2,735,276,000
Ownership percentage, guarantors (as percent)	100.00%
Unsecured Senior Notes
Debt Instrument [Line Items]
Long-term debt, fair value	$ 2,008,600,000
Amended Credit Facility
Debt Instrument [Line Items]
Line of credit facility, remaining borrowing capacity	843,000,000
Swingline Loan \| The Credit Agreement
Debt Instrument [Line Items]
Credit facility borrowing base	10,000,000
Credit Facility \| Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	14,000,000
Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility amount	$ 3,000,000,000
Weighted average interest rate (as percent)	4.20%
Credit Facility \| Revolving Credit Facility \| Oasis Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 493,000,000			468,000,000
Weighted average interest rate (as percent)	4.20%
Credit Facility \| Revolving Credit Facility \| OMP Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 345,000,000			318,000,000
Credit facility borrowing base	400,000,000
Line of credit facility, remaining borrowing capacity	55,000,000
Senior Notes
Debt Instrument [Line Items]
Debt issuance costs	19,692,000			20,865,000
Long-term debt, gross	2,039,409,000			2,039,409,000
Senior Notes \| 2022 and 2023 Notes
Debt Instrument [Line Items]
Total long-term debt	1,267,600,000
Senior Notes \| Notes [Member]
Debt Instrument [Line Items]
Unsecured debt	$ 1,739,400,000
Senior Notes \| Notes [Member] \| Minimum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.25%
Senior Notes \| Notes [Member] \| Maximum
Debt Instrument [Line Items]
Stated interest rate (as percent)	6.875%
Senior Notes \| 6.50% senior unsecured notes due November 1, 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 71,835,000			71,835,000
Stated interest rate (as percent)	6.50%
Senior Notes \| 6.875% senior unsecured notes due March 15, 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 901,480,000			901,480,000
Stated interest rate (as percent)	6.875%
Senior Notes \| 6.875% senior unsecured notes due January 15, 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 366,094,000			366,094,000
Stated interest rate (as percent)	6.875%
Senior Notes \| 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Total long-term debt	$ 300,000,000
Debt discount	66,384,000			69,268,000
Long-term debt, gross	$ 300,000,000			$ 300,000,000
Stated interest rate (as percent)	2.625%
Debt issued	$ 300,000,000
Debt conversion rate per $1000 principal (in shares per $1000)	0.0763650
Debt conversion price (in dollars per share) \| $ / shares	$ 13.10
Revolving Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
Debt Conversion Scenario 1 \| Senior Notes \| 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Number of trading days \| day	20
Number of consecutive trading days \| day	30
Stock price relative to conversion price (percent)	130.00%
Debt Conversion Scenario 2 \| Senior Notes \| 2.625% senior unsecured convertible notes due September 15, 2023
Debt Instrument [Line Items]
Number of trading days \| day	5
Number of consecutive trading days \| day	5
Stock price relative to product of sale price and conversion rate (percent)	98.00%
OMP Operating, LLC \| Letter of Credit
Debt Instrument [Line Items]
Credit facility borrowing base	$ 10,000,000
OMP Operating, LLC \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity subject to certain conditions	$ 600,000,000
OMP Operating, LLC \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage	0.375%
OMP Operating, LLC \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage	0.50%
OMP Operating, LLC \| ABR Loans \| Revolving Credit Facility \| Federal Funds Effective Swap Rate
Debt Instrument [Line Items]
Spread on variable rate	0.50%
OMP Operating, LLC \| ABR Loans \| Revolving Credit Facility \| LIBOR
Debt Instrument [Line Items]
Spread on variable rate	1.00%
OMP Operating, LLC \| Eurodollar Loans \| Revolving Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
OMP Operating, LLC \| Eurodollar Loans \| Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	2.75%
OMP Operating, LLC \| ABR Loans or Swingline Loans \| Revolving Credit Facility \| Federal Funds Effective Swap Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.75%
OMP Operating, LLC \| ABR Loans or Swingline Loans \| Revolving Credit Facility \| Federal Funds Effective Swap Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
OMP Operating, LLC \| ABR Loans or Swingline Loans \| Revolving Credit Facility \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate	0.75%
OMP Operating, LLC \| ABR Loans or Swingline Loans \| Revolving Credit Facility \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate	1.75%
Subsequent Event \| Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing base			$ 1,600,000,000
Line of credit facility, current borrowing capacity			1,350,000,000
Subsequent Event \| Credit Facility \| Revolving Credit Facility \| OMP Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing base		$ 475,000,000
Maximum borrowing capacity subject to certain conditions		$ 675,000,000
Subsequent Event \| Swingline Loan \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility borrowing base			$ 50,000,000