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Real Estate Fund Investments - Schedule of Investments of Property Funds (Details)
Mar. 31, 2015
60 Wall Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 100.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_RealEstatePropertiesAxis
= pgre_SixZeroWallStreetMember
One Market Plaza [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 100.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember
50 Beale Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 100.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_RealEstatePropertiesAxis
= pgre_FiftyBealeStreetMember
Fund II [Member] | 60 Wall Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 46.30%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundIIMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_SixZeroWallStreetMember
Fund III [Member] | 60 Wall Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 16.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundIIIMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_SixZeroWallStreetMember
Fund III [Member] | One Market Plaza [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 2.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundIIIMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember
Fund VII [Member] | 50 Beale Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 41.10%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundVIIMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_FiftyBealeStreetMember
Fund VII-H [Member] | 50 Beale Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 1.70%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundVIIHMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_FiftyBealeStreetMember
Property Funds [Member] | 60 Wall Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 62.30%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_SixZeroWallStreetMember
Property Funds [Member] | One Market Plaza [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 2.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember
Property Funds [Member] | 50 Beale Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 42.80%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_PropertyFundsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_FiftyBealeStreetMember
Other Investors [Member] | 60 Wall Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 37.70%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_OtherInvestorsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_SixZeroWallStreetMember
Other Investors [Member] | One Market Plaza [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 98.00%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_OtherInvestorsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember
Other Investors [Member] | 50 Beale Street [Member]  
Investment Holdings [Line Items]  
Property funds, percentage 57.20%pgre_OwnershipPercentageInPropertyFunds
/ us-gaap_InvestmentTypeAxis
= pgre_OtherInvestorsMember
/ us-gaap_RealEstatePropertiesAxis
= pgre_FiftyBealeStreetMember