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Leases - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 24, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) Agreement | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Item
Operating Leased Assets [Line Items] |  |  |  |  |  |
Variable lease revenues |  |  |  | $ 42,800 | $ 41,800 |
Operating lease right-of-use asset |  | $ 41,577 |  | 41,577 |  | $ 76,268
Payments to Tenant | $ 5,400 |  |  |  |  |
Lease liability - operating lease |  | 39,743 |  | 39,743 |  | 88,816
Gain (loss) on termination of lease |  |  |  | 3,615 | 0 |
Gain on disposition of properties |  | 0 | $ 24 | 10,521 | 509 |
Impairment charges |  | $ 9,925 | $ 0 | $ 9,925 | $ 51,549 |
Lease agreement purchase price |  |  |  |  |  | $ 14,500
Minimum |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease term |  | 1 month |  | 1 month |  |
Minimum | Consolidated Total Revenues | Customer Concentration Risk |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Concentration risk, percentage |  | 10.00% | 10.00% | 10.00% | 10.00% |
Maximum |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease term |  | 60 years |  | 60 years |  |
991 Madison Avenue Manhattan, NY | Accounting Standards Update 2016-02 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Capital lease term |  |  |  |  |  | 49 years
Operating Lease term |  |  |  |  |  | 15 years
1238 Wisconsin |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  |  | $ 1,900
Operating lease liability |  |  |  |  |  | 1,900
Lease agreement purchase price |  |  |  |  |  | 11,500
COVID-19 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Impairment charges |  | $ 2,300 |  | $ 2,300 | $ 12,400 |
Number of rent concession agreements | Agreement |  |  |  | 84 |  |
Number of rent concession agreements for rent deferral | Agreement |  |  |  | 18 |  |
Number of rent concession agreements for rent abatements | Agreement |  |  |  | 66 |  |
Number of rent concession agreements accounted as no change in contract | Agreement |  |  |  | 16 |  |
Deferred receivables |  | 6,400 |  | $ 6,400 |  |
Rent abatements |  |  |  | 3,000 |  |
Aggregate credit losses and rent abatements |  | $ (300) | $ 13,300 | $ 3,400 | $ 26,900 |
Pro rata core leased occupancy rate percentage |  |  |  | 92.60% | 91.10% |
Pro rata fund leased occupancy rate percentage |  |  |  | 90.00% | 89.80% |
Core Portfolio | COVID-19 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Percentage of rent collections |  | 97.10% |  | 97.10% |  |
Opportunity Funds | COVID-19 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Percentage of rent collections |  | 92.50% |  | 92.50% |  |
Fund IV Property |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  | $ 31,400 |  | $ 31,400 |  |
Termination cost |  |  |  | 3,600 |  |
Lease liability - operating lease |  | 46,000 |  | 46,000 |  |
Building improvements and other assets |  | 10,300 |  | 10,300 |  |
Gain (loss) on termination of lease |  |  |  | 700 |  |
Gain on disposition of properties |  |  |  | 200 |  |
Impairment charge of right-of-use asset |  |  |  |  |  | 12,300
Rye Corporate Office Lease |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  | 400 |  | 400 |  |
Operating lease liability |  | $ 400 |  | $ 400 |  |
Office Lease |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  |  | 1,700
Lease liability - operating lease |  |  |  |  |  | $ 1,700
Number of operating lease | Item |  |  |  |  |  | 1
BSP II |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of operating lease | Item |  |  |  |  |  | 1
Branch Plaza |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of operating lease | Item |  |  |  |  |  | 1
Operating Lease term |  |  |  |  |  | 22 years

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