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v3.19.3.a.u2

Debt - Summary of Outstanding Debt (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
One Market Plaza [Member] |  |
Debt Instrument [Line Items] |  |
Ownership interest rate of property | 49.00% | 49.00%
300 Mission Street [Member] |  |
Debt Instrument [Line Items] |  |
Ownership interest rate of property | 31.10% | 31.10%

X
- Definition Ownership percentage of property. + References No definition available. + Details
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Namespace Prefix: | pgre_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=pgre_OneMarketPlazaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=pgre_ThreeHundredMissionStreetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |