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Intangible Assets and Intangible Liabilities - Schedule of Estimated Annual Amortization of Acquired Below-Market Leases, Net of Acquired Above-Market Leases (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]  
2016 $ 9,387pgre_BelowMarketLeaseAmortizationIncomeNetOfAboveMarketLeaseAmortizationNextTwelveMonths
2017 7,791pgre_BelowMarketLeaseAmortizationIncomeNetOfAboveMarketLeaseAmortizationYearTwo
2018 9,906pgre_BelowMarketLeaseAmortizationIncomeNetOfAboveMarketLeaseAmortizationYearThree
2019 9,328pgre_BelowMarketLeaseAmortizationIncomeNetOfAboveMarketLeaseAmortizationYearFour
2020 $ 8,021pgre_BelowMarketLeaseAmortizationIncomeNetOfAboveMarketLeaseAmortizationYearFive