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Equity and Share-Based Compensation (Details 2) (Incentive units, USD $)
3 Months Ended
Mar. 31, 2015
Incentive units
 
Restricted Stock Awards  
Incentive units issued 1,099us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= mpo_IncentiveUnitsMember
Stock-based compensation expense (in dollars) $ 0mpo_VariableCompensationExpense
/ us-gaap_AwardTypeAxis
= mpo_IncentiveUnitsMember