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Organization and Business - Additional Information (Details) (USD $)
 3 Months Ended 0 Months Ended
Mar. 31, 2015
sqft
Properties
Nov. 24, 2014
Real Estate Properties [Line Items]    
Number of office properties 12us-gaap_NumberOfRealEstateProperties  
Area of office properties 10,400,000us-gaap_AreaOfRealEstateProperty  
Office properties leased percentage 94.60%pgre_PercentageOfSquareFeetOfficePropertiesLeased  
Office properties occupied percentage 91.30%pgre_PercentageOfSquareFeetOfOfficePropertiesOccupied  
Percentage of ownership in operating partnership 80.40%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest  
Predecessor [Member]    
Real Estate Properties [Line Items]    
Number of office properties 12us-gaap_NumberOfRealEstateProperties
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Number of real estate funds 15pgre_NumberOfRealEstateFunds
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Predecessor [Member] | Primary Funds [Member]    
Real Estate Properties [Line Items]    
Number of real estate funds 9pgre_NumberOfRealEstateFunds
/ us-gaap_RealEstatePropertiesAxis
= pgre_PrimaryFundsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Predecessor [Member] | Parallel Funds [Member]    
Real Estate Properties [Line Items]    
Number of real estate funds 6pgre_NumberOfRealEstateFunds
/ us-gaap_RealEstatePropertiesAxis
= pgre_ParallelFundsMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Predecessor [Member] | Partially Owned Properties [Member]    
Real Estate Properties [Line Items]    
Number of office properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_PartiallyOwnedPropertiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
IPO [Member]    
Real Estate Properties [Line Items]    
Common shares issued, initial public offering, shares   150,650,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Common stock, share price   $ 17.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember