Ownership percentage for tenants in common interest in property.

No definition available.

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

- Definition

Predecessor ownership percentage of property.

+ References

No definition available.

+ Details

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

- Definition

Minimum duration of a put right notice required to be provided by the partner to exercise the put right.

+ References

No definition available.

+ Details

Name:	pgre_PutRightNoticePeriod
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

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

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

+ Details

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

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Balance Type:	na
Period Type:	duration

- Details

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- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=pgre_RetailTypeSpaceMember
Namespace Prefix:
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Commitments and Contingencies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2017	Jun. 30, 2018 ft²	Feb. 16, 2018 USD ($)	Nov. 23, 2014 ft²
Other Commitments [Line Items]
Area of office properties \| ft²		12,500,000
Minimum \| New York State Division Of Taxation And Finance [Member]
Other Commitments [Line Items]
Loss Contingency, Estimate of Possible Loss \| $			$ 0
Maximum \| New York State Division Of Taxation And Finance [Member]
Other Commitments [Line Items]
Loss Contingency, Estimate of Possible Loss \| $			$ 38,000,000
718 Fifth Avenue [Member]
Other Commitments [Line Items]
Put right notice period	12 months
712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage		50.00%
Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Percentage of tenancy-in-common interest in property				50.00%
Predecessor [Member] \| 712 Fifth Avenue [Member]
Other Commitments [Line Items]
Equity method ownership percentage	50.00%
Owned by Affiliate [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member] \| Third Party Affiliate [Member]
Other Commitments [Line Items]
Equity method ownership percentage				25.00%
Owned by Affiliate [Member] \| Parent Company [Member] \| Put Right Exercised [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Pre IPO ownership percentage	25.00%
Owned by Affiliate [Member] \| Retail Type Space [Member] \| Predecessor [Member] \| 718 Fifth Avenue [Member]
Other Commitments [Line Items]
Area of office properties \| ft²				19,050