Economic interest percentage.

No definition available.

Name:	pgre_EconomicInterestPercentage
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Extended term of mortgage loans on real estate new mortgage loans.

+ References

No definition available.

+ Details

Name:	pgre_ExtendedTermOfMortgageLoansOnRealEstateNewMortgageLoans
Namespace Prefix:	pgre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of interest acquired.

+ References

No definition available.

+ Details

Name:	pgre_PercentageOfInterestAcquired
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of interest directly acquired in property.

+ References

No definition available.

+ Details

Name:	pgre_PercentageOfInterestDirectlyAcquiredInProperty
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of ownership interest in joint venture held by co venturer.

+ References

No definition available.

+ Details

Name:	pgre_PercentageOfOwnershipInterestInJointVentureHeldByCoVenturer
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of ownership interest in new joint venture.

+ References

No definition available.

+ Details

Name:	pgre_PercentageOfOwnershipInterestInNewJointVenture
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of remaining interest acquired in property by new joint venture.

+ References

No definition available.

+ Details

Name:	pgre_PercentageOfRemainingInterestAcquiredInPropertyByNewJointVenture
Namespace Prefix:	pgre_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of mortgage loans on real estate new mortgage loans.

+ References

No definition available.

+ Details

Name:	pgre_TermOfMortgageLoansOnRealEstateNewMortgageLoans
Namespace Prefix:	pgre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of assets acquired at the acquisition date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

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

- Definition

Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

+ References

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Footnote 6))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateNewMortgageLoans
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_RealEstatePropertiesAxis=pgre_OneHundredAndElevenSutterStreetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RealEstatePropertiesAxis=pgre_FiftyBealeStreetMember
Namespace Prefix:
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Period Type:

Acquisitions - Additional Information (Details)	Feb. 07, 2019 USD ($) ft²	Dec. 31, 2018 ft²	Jul. 17, 2017 USD ($) ft²
Business Acquisition [Line Items]
Area of office and retail properties \| ft²		11,900,000
111 Sutter Street [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Area of office and retail properties \| ft²	293,000
Business combination, consideration transferred	$ 227,000,000
Percentage of ownership interest in new joint venture	49.00%
Percentage of ownership interest in joint venture held by co-venturer	51.00%
Mortgage financing amount	$ 138,200,000
Term of mortgage financing loan	4 years
Extended term of mortgage financing loan, interest only	3 years
111 Sutter Street [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Subsequent Event [Member]
Business Acquisition [Line Items]
Mortgage financing loan, interest only basis points at LIBOR	2.15%
50 Beale Street [Member]
Business Acquisition [Line Items]
Area of office and retail properties \| ft²			660,625
Percentage of ownership interest in new joint venture			36.60%
Percentage of interest acquired			62.20%
Percentage of interest directly acquired in property			13.20%
Percentage of remaining interest acquired in property by new joint venture.			49.00%
Property funds, ownership percentage			31.10%
Property funds, ownership amount			$ 517,500,000
Value of debt assumed with acquisition			$ 228,000,000