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Investments in Partially Owned Entities - Summary of Investments in Partially Owned Entities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule Of Equity Method Investments [Line Items]    
Investments in partially owned entities $ 6,370us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 5,749us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
712 Fifth Avenue [Member]    
Schedule Of Equity Method Investments [Line Items]    
Equity method ownership percentage 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_SevenOneTwoFifthAvenueMember		  
Investments in partially owned entities 2,319us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_SevenOneTwoFifthAvenueMember		 1,697us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_SevenOneTwoFifthAvenueMember
Other [Member]    
Schedule Of Equity Method Investments [Line Items]    
Equity method ownership percentage 9.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_OtherEquityMethodInvestmentsMember		  
Investments in partially owned entities $ 4,051us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_OtherEquityMethodInvestmentsMember		 $ 4,052us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= pgre_OtherEquityMethodInvestmentsMember