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Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Property-related revenues | $ 746,436 | $ 740,332 | $ 694,755
Property-related operating expenses | (274,836) | (274,078) | (266,136)
NOI from unconsolidated joint ventures | 22,409 | 20,730 | 19,643
NOI | 494,009 | 486,984 | 448,262
New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property-related revenues | 482,648 | 468,013 | 430,548
Property-related operating expenses | (191,211) | (188,008) | (180,855)
NOI from unconsolidated joint ventures | 13,151 | 20,395 | 19,143
NOI | 304,588 | 300,400 | 268,836
San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property-related revenues | 238,808 | 222,071 | 191,677
Property-related operating expenses | (69,815) | (60,043) | (50,906)
NOI from unconsolidated joint ventures | 9,065 |  |
NOI | 178,058 | 162,028 | 140,771
Washington, D.C. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property-related revenues | 25,426 | 51,290 | 72,143
Property-related operating expenses | (10,134) | (19,381) | (27,342)
NOI | 15,292 | 31,909 | 44,801
Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property-related revenues | (446) | (1,042) | 387
Property-related operating expenses | (3,676) | (6,646) | (7,033)
NOI from unconsolidated joint ventures | 193 | 335 | 500
NOI | $ (3,929) | $ (7,353) | $ (6,146)

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- Definition This element represents the company's operating income from the properties including its pro rata share of equity method investments which is calculated as net income before depreciation and amortization, general and administrative expenses, interest and debt expenses and income taxes. + References No definition available. + Details
Name: | pgre_NetOperatingIncome
Namespace Prefix: | pgre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the company's pro rata operating income from equity method investments which is calculated as net income before depreciation and amortization, general and administrative expenses, interest and debt expenses and income taxes. + References No definition available. + Details
Name: | pgre_NetOperatingIncomeFromEquityMethodInvestments
Namespace Prefix: | pgre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Property related revenues. + References No definition available. + Details
Name: | pgre_PropertyRelatedRevenues
Namespace Prefix: | pgre_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
Name: | us-gaap_OperatingCostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=pgre_WashingtonDistrictOfColumbiaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |