Face (par) amount of the original debt instrument that was exchanged with other debt issued during the period.

No definition available.

Name:	mpo_DebtInstrumentExchangedFaceAmount
Namespace Prefix:	mpo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of par value of debt exchanged.

+ References

No definition available.

+ Details

Name:	mpo_DebtInstrumentExchangedPercentageOfPrincipalAmount
Namespace Prefix:	mpo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of notional volumes of the derivatives compared to the notional volumes for the previous period.

+ References

No definition available.

+ Details

Name:	mpo_DerivativeNonmonetaryNotionalAmountPercentageComparedToPreviousPeriod
Namespace Prefix:	mpo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the increase (decrease) in the borrowing base available under a line of credit as of the date of the amendment.

+ References

No definition available.

+ Details

Name:	mpo_LineOfCreditFacilityChangeInBorrowingBase
Namespace Prefix:	mpo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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

- Definition

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeCashReceivedOnHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis=mpo_DequincyAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_SeniorRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_SecondLienNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_ThirdLienNotes12PercentDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_SeniorNotesUnsecured10.75PercentDue2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_SeniorNotesUnsecured9.25PercentDue2021Member
Namespace Prefix:
Data Type:	na
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Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mpo_SeniorNotesUnsecuredMember
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Liquidity and Capital Resources (Details) $ in Thousands				3 Months Ended	6 Months Ended
Liquidity and Capital Resources (Details) $ in Thousands	Jun. 02, 2015 USD ($)	Jun. 02, 2015 USD ($)	May. 21, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 item	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Apr. 21, 2015 USD ($)	May. 31, 2013 USD ($)	Oct. 01, 2012 USD ($)
Cash payment on derivative contract settlement				$ 42,200		$ 94,797	$ (31,948)
Principle Balance Outstanding				1,791,585		1,791,585
Amount repaid						468,150	$ 131,000
Dequincy assets
Purchase price of subject to standard post-closing adjustments received in cash								$ 44,000
Senior Revolving Credit Facility, due 2018
Amount repaid			$ 468,200			468,150
Borrowing base	$ 252,400	$ 252,400
Second Lien Notes
Principle Balance Outstanding			$ 625,000	$ 625,000		$ 625,000
Interest rate (as a percent)			10.00%	10.00%		10.00%
Third Lien Notes
Principle Balance Outstanding	20,000	20,000	$ 504,100	$ 525,308		$ 525,308
Interest rate (as a percent)			12.00%
Par value of debt exchanged for						524,121
2020 Senior Notes
Principle Balance Outstanding				293,625		293,625				$ 600,000
Interest rate (as a percent)			10.75%
Par value of debt exchanged for	(306,400)	26,600	$ 279,800			(242,445)
2021 Senior Notes
Principle Balance Outstanding				$ 347,652		347,652			$ 700,000
Interest rate (as a percent)			9.25%
Par value of debt exchanged for	$ 352,300	$ 2,000	$ 350,300			$ (281,676)
Unsecured Notes
Percentage of exchanged debt's par value		70.00%	80.00%			80.00%
Forecast
Percentage of notional volumes for second half of 2015, compared with first half of 2015					50.00%
Number of derivatives held \| item					0