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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]    
Asset retirement obligations $ 6.0us-gaap_AssetRetirementObligation  
Legal Reserve    
Commitments and Contingencies Disclosure [Line Items]    
Reserve established for contingency matters 0.3us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_LegalReserveMember
0.9us-gaap_ValuationAllowancesAndReservesPeriodIncreaseDecrease
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_LegalReserveMember
Contract Drilling    
Commitments and Contingencies Disclosure [Line Items]    
Contract termination claims description early termination provisions that would require us to pay penalties if we terminate the agreements prior to the end of their scheduled terms.  
Loss on contract termination for default 16.2us-gaap_LossOnContractTerminationForDefault
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_ContractDrillingMember
 
Contractual obligation, balance of 2015 14.6us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_ContractDrillingMember
 
Contractual obligation, 2016 1.1us-gaap_ContractualObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_ContractDrillingMember
 
Coil Tubing Services    
Commitments and Contingencies Disclosure [Line Items]    
Contractual obligation, balance of 2015 4.8us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_CoilTubingServicesMember
 
Firm Transportation    
Commitments and Contingencies Disclosure [Line Items]    
Contractual obligation, balance of 2015 1.5us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_FirmTransportationMember
 
Firm Transportation | Through 2028    
Commitments and Contingencies Disclosure [Line Items]    
Contractual obligation, annual 1.1pva_ContractualObligationAnnual
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_FirmTransportationMember
/ pva_PeriodAxis
= pva_FuturePeriodSixMember
 
Firm Transportation | Maximum    
Commitments and Contingencies Disclosure [Line Items]    
Contract term 13 years  
Gas Gathering And Compression Services    
Commitments and Contingencies Disclosure [Line Items]    
Contractual obligation, balance of 2015 3.2us-gaap_ContractualObligationDueInSecondYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_GasGatheringAndCompressionServicesMember
 
Contractual obligation, 2016 5.0us-gaap_ContractualObligationDueInThirdYear
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_GasGatheringAndCompressionServicesMember
 
Crude Oil Gathering And Transportation Services    
Commitments and Contingencies Disclosure [Line Items]    
Contractual obligation, annual $ 13.7pva_ContractualObligationAnnual
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= pva_CrudeOilGatheringAndTransportationServicesMember