Equity method investment summarized financial information realized gain (losses) net.

No definition available.

Name:	pgre_EquityMethodInvestmentSummarizedFinancialInformationRealizedGainLossesNet
Namespace Prefix:	pgre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Equity method investment summarized financial information unrealized gain (losses) net.

+ References

No definition available.

+ Details

Name:	pgre_EquityMethodInvestmentSummarizedFinancialInformationUnrealizedGainLossesNet
Namespace Prefix:	pgre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its real estate fund investments to which equity method of accounting is applied.

+ References

No definition available.

+ Details

Name:	pgre_IncomeLossFromUnconsolidatedRealEstateFund
Namespace Prefix:	pgre_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_RealEstateInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(d))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_InvestmentIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_InterestIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=pgre_PropertyFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=pgre_AlternativeInvestmentFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Investments in Unconsolidated Real Estate Funds - Summary of Investment in Unconsolidated Real Estate Funds and Income or Loss from Fund Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Our Share of Investments:
Investments in unconsolidated real estate funds	$ 7,276		$ 7,253
(Loss) income from unconsolidated real estate funds	(66)	$ 288
Net realized gain		179
Net unrealized (loss) gain	(132)	96
Net investment income [Member]
Our Share of Investments:
(Loss) income from unconsolidated real estate funds	66	53
Carried interest [Member]
Our Share of Investments:
(Loss) income from unconsolidated real estate funds		$ (40)
Property Funds [Member]
Our Share of Investments:
Investments in unconsolidated real estate funds	2,443		2,429
Alternative Investment Fund [Member]
Our Share of Investments:
Investments in unconsolidated real estate funds	$ 4,833		$ 4,824