Risk Management and Derivative Instruments (Details) - Jun. 30, 2015 - Not designated as Hedging Instrument - Commodity Derivatives $ in Millions	USD ($) MMBTU $ / bbl $ / MMBTU bbl
Risk Management and Derivative Instruments
Maximum loss exposure under commodity derivative contracts on failure of the entity's counterparty's performance \| $	$ 35.9
Oil \| WTI \| Swaps \| 2015
Risk Management and Derivative Instruments
Weighted-Average Fixed Price \| $ / bbl	71.56
Hedged Volume \| bbl	2,208,000
Gas \| Swaps \| 2015
Risk Management and Derivative Instruments
Weighted-Average Fixed Price \| $ / MMBTU	4.13
Hedged Volume	9,200,000
Hedged Volume, not settled in cash	1,550,000

Maximum loss exposure under commodity derivative contracts on failure of the entity's counterparty's performance.

No definition available.

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Balance Type:	credit
Period Type:	instant

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units which is yet to be settled in cash. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

No definition available.

+ Details

Name:	mpo_DerivativeNonmonetaryNotionalAmountYetToBeSettledInCash
Namespace Prefix:	mpo_
Data Type:	num:energyItemType
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.

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

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

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No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

- 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

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in energy volume but not the derivative contract itself.

+ References

No definition available.

+ Details

Name:	us-gaap_UnderlyingDerivativeEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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

- Details

Name:	us-gaap_EnergyAxis=us-gaap_OilReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	invest_InvestmentSectorAxis=mpo_WestTexasIntermediateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_SwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	mpo_DerivativeContractMaturityYearAxis=mpo_DerivativeContractMaturityInYear2015Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnergyAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: