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Debt - Summary of Outstanding Debt (Parenthetical) (Details)
 3 Months Ended
Mar. 31, 2015
31 West 52nd Street [Member]  
Debt Instrument [Line Items]  
Ownership interest rate of property 64.20%pgre_OwnershipPercentageOfProperty
/ us-gaap_RealEstatePropertiesAxis
= pgre_ThreeOneWestFiftySecondStreetMember
One Market Plaza [Member]  
Debt Instrument [Line Items]  
Ownership interest rate of property 49.00%pgre_OwnershipPercentageOfProperty
/ us-gaap_RealEstatePropertiesAxis
= pgre_OneMarketPlazaMember