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Benefit Plans - Narrative (Details) (USD $)
 1 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]              
Company contributions $ 12,638,000us-gaap_DefinedBenefitPlanContributionsByEmployer   $ 0us-gaap_DefinedBenefitPlanContributionsByEmployer $ 12,638,000us-gaap_DefinedBenefitPlanContributionsByEmployer      
Company contributions deductible on the 2012 tax return   11,000,000prk_CompanyContributionDeductibleOnTwoThousandTwelveTaxReturn          
Company Contribution Deductible On Two Thousand Thirteen Tax Return 1,600,000prk_CompanyContributionDeductibleOnTwoThousandThirteenTaxReturn            
Accumulated benefit obligation for the pension plan     92,000,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation 75,900,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation      
Common share purchased under pension plan, shares             115,800prk_CommonSharePurchasedUnderPensionPlanShares
Common share purchased under pension plan, value             7,000,000prk_CommonSharePurchasedUnderPensionPlanValue
Common share purchased under pension plan, value per share             $ 60.45prk_CommonSharePurchasedUnderPensionPlanValuePerShare
Fair value, pension plan common shares held, shares     115,800prk_CommonSharesHeldUnderPensionPlanShares 115,800prk_CommonSharesHeldUnderPensionPlanShares      
Fair value of common shares held by pension plan     10,200,000prk_CommonSharesHeldUnderPensionPlanFairValue 9,900,000prk_CommonSharesHeldUnderPensionPlanFairValue      
Fair value of common shares held by pension plan, per share     $ 88.48prk_FairValuePensionPlanCommonSharesHeldPerShare $ 85.07prk_FairValuePensionPlanCommonSharesHeldPerShare      
Estimated net actuarial (loss) expected to be recognized in the next fiscal year     0us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss (2,703,000)us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss (1,708,000)us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss    
Expected long-term return on plan assets     7.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 7.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets    
Cash balance in bank     1,900,000us-gaap_DefinedBenefitPlanCurrentAssets        
Market value of pension plan assets     160,600,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent 152,700,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsCurrentAndNoncurrent      
Defined Contribution Plan, Cost Recognized     1,100,000us-gaap_DefinedContributionPlanCostRecognized 1,100,000us-gaap_DefinedContributionPlanCostRecognized 1,000,000us-gaap_DefinedContributionPlanCostRecognized    
Pension Plans              
Defined Benefit Plan Disclosure [Line Items]              
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year     15,000us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		        
S&P 500 Index              
Defined Benefit Plan Disclosure [Line Items]              
Expected long-term rate of return on plan assets     7.25%prk_DefinedBenefitPlanExpectedReturnOnPlanAssetsPercentage
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= prk_SAndPFiveHundredIndexMember		        
Supplemental Executive Retirement Plan (SERP)              
Defined Benefit Plan Disclosure [Line Items]              
Benefit expense     200,000prk_DefinedBenefitPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 200,000prk_DefinedBenefitPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 300,000prk_DefinedBenefitPlanCostRecognized
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		    
Accrued benefit cost     7,600,000prk_AccruedBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		 6,800,000prk_AccruedBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember		      
Level 1              
Defined Benefit Plan Disclosure [Line Items]              
Equity investments     141,100,000us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 128,700,000us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		      
Level 2              
Defined Benefit Plan Disclosure [Line Items]              
Equity investments     19,500,000us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 24,000,000us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		      
Level 3              
Defined Benefit Plan Disclosure [Line Items]              
Equity investments     0us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_EquityMethodInvestments
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		      
Scenario, Forecast [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Estimated net actuarial (loss) expected to be recognized in the next fiscal year           $ 637,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember