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Real Estate Fund Investments - Schedule of Fair Value of Income from Fund Investment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Investment Holdings [Line Items]  
Income from real estate fund investments $ 5,221pgre_IncomeFromRealEstateFund
Investment Income [Member]  
Investment Holdings [Line Items]  
Income from real estate fund investments 4,495pgre_IncomeFromRealEstateFund
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeMember
Investment Expenses [Member]  
Investment Holdings [Line Items]  
Income from real estate fund investments 147pgre_IncomeFromRealEstateFund
/ us-gaap_IncomeStatementLocationAxis
= pgre_InvestmentExpensesMember
Net Investment Income [Member]  
Investment Holdings [Line Items]  
Income from real estate fund investments 4,348pgre_IncomeFromRealEstateFund
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_InvestmentIncomeExpenseMember
Net Unrealized Gains [Member]  
Investment Holdings [Line Items]  
Income from real estate fund investments $ 873pgre_IncomeFromRealEstateFund
/ us-gaap_IncomeStatementLocationAxis
= pgre_NetUnrealizedGainsMember