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Components of Selected Balance Sheet Accounts (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation-related obligations [Line Items]      
Recognized expense $ 1,700,000us-gaap_DefinedContributionPlanCostRecognized $ 1,000,000us-gaap_DefinedContributionPlanCostRecognized $ 900,000us-gaap_DefinedContributionPlanCostRecognized
Compensation 9,197,000us-gaap_EmployeeRelatedLiabilitiesCurrent [1],[2] 8,584,000us-gaap_EmployeeRelatedLiabilitiesCurrent [1],[2]  
Unfunded Defined Benefit Plan      
Compensation-related obligations [Line Items]      
Defined benefit pension and postretirement health care plans 2,800,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_UnfundedDefinedBenefitPlanMember
3,000,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_UnfundedDefinedBenefitPlanMember
 
Pension and postretirement benefit expense 100,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_UnfundedDefinedBenefitPlanMember
300,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_UnfundedDefinedBenefitPlanMember
300,000us-gaap_PensionAndOtherPostretirementBenefitExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_UnfundedDefinedBenefitPlanMember
Defined Contribution Retirement Plan      
Compensation-related obligations [Line Items]      
Compensation 300,000us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_DefinedContributionRetirementPlanMember
200,000us-gaap_EmployeeRelatedLiabilitiesCurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= pva_DefinedContributionRetirementPlanMember
 
Performance Based Restricted Stock Units (PBRSUs)      
Compensation-related obligations [Line Items]      
Liability-classifed share-based compensation awards, noncurrent 6,400,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
4,800,000us-gaap_DeferredCompensationSharebasedArrangementsLiabilityClassifiedNoncurrent
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Liability-classified share-based compensation awards, current $ 2,900,000us-gaap_DeferredCompensationShareBasedArrangementsLiabilityCurrent
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
   
[1] Includes employer matching obligations under our defined contribution retirement plan of $0.3 million and $0.2 million as of December 31, 2014 and 2013, respectively. The expense recognized with respect to this plan was $1.7 million, $1.0 million and $0.9 million for the years ended December 31, 2014, 2013 and 2012, respectively.
[2] Includes the combined unfunded benefit obligations under our defined benefit pension and postretirement health care plans of $2.8 million and $3.0 million as of December 31, 2014 and 2013. The expense recognized with respect to these plans was $0.1 million, $0.3 million and $0.3 million for the years ended December 31, 2014, 2013 and 2012, respectively.