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Income Taxes - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Valuation Allowance [Line Items]      
Deferred tax assets, valuation allowance $ 105,615,000us-gaap_DeferredTaxAssetsValuationAllowance $ 35,727,000us-gaap_DeferredTaxAssetsValuationAllowance  
Liabilities for unrecognized tax benefits 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits  
Interest and penalty charges 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense 0us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Federal      
Valuation Allowance [Line Items]      
Operating loss carryforwards 166,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
   
Federal | Minimum      
Valuation Allowance [Line Items]      
Operating loss carryforward expiration year 2032    
Federal | Maximum      
Valuation Allowance [Line Items]      
Operating loss carryforward expiration year 2033    
State and Local Jurisdiction      
Valuation Allowance [Line Items]      
Operating loss carryforwards 67,500,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
   
Operating loss carryforwards, valuation allowance   35,700,000us-gaap_OperatingLossCarryforwardsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
State and Local Jurisdiction | Minimum      
Valuation Allowance [Line Items]      
Operating loss carryforward expiration year 2024    
State and Local Jurisdiction | Maximum      
Valuation Allowance [Line Items]      
Operating loss carryforward expiration year 2034    
Federal, State and Local Tax Jurisdictions      
Valuation Allowance [Line Items]      
Deferred tax assets, valuation allowance 105,600,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= pva_FederalStateandLocalTaxJurisdictionsMember
   
Federal and state valuation allowance established against net deferred tax assets $ 62,800,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_IncomeTaxAuthorityAxis
= pva_FederalStateandLocalTaxJurisdictionsMember