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Subsequent Events (Details) - Subsequent Event [Member] - Crude Oil [Member] bbl in Thousands	1 Months Ended
	Jul. 31, 2017 $ / bbl bbl
2017 Swaps and Two-way Collar Options [Member]
Subsequent Event [Line Items]
Total ntional amount of oil (in Bbls) | bbl	244
Weighted average floor price (in dollars per barrel) | $ / bbl	49.43
2018 Swaps and Two-way Collar Options [Member]
Subsequent Event [Line Items]
Total ntional amount of oil (in Bbls) | bbl	2,915
Weighted average floor price (in dollars per barrel) | $ / bbl	48.59
2019 Swaps and Two-way Collar Options [Member]
Subsequent Event [Line Items]
Total ntional amount of oil (in Bbls) | bbl	248
Weighted average floor price (in dollars per barrel) | $ / bbl	48.49

X

- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

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- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandSeventeenSwapsandTwowayCollarOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandEighteenSwapsandTwowayCollarOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenSwapsandTwowayCollarOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: