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Real Estate Fund Investments - Schedule of Investments of Property Funds (Parenthetical) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
One Market Plaza [Member]  
Investment Holdings [Line Items]  
Ownership interest rate of property 49.00%pgre_OwnershipPercentageOfProperty
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember
Fund VII and VII-H [Member]  
Investment Holdings [Line Items]  
Committed capital that had not yet been invested 57.6pgre_CapitalCommitmentNotInvested
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundVIIAndVIIHMember
Other Investors [Member] | One Market Plaza [Member]  
Investment Holdings [Line Items]  
Ownership interest rate of property 49.00%pgre_OwnershipPercentageOfProperty
/ us-gaap_InvestmentTypeAxis
= pgre_OtherInvestorsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember