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Leases - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 | Sep. 30, 2020 USD ($) item Aqreement Store | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) item
Operating Leased Assets [Line Items] |  |  |  |  |  |
Variable lease revenues | $ 14,500 | $ 14,700 |  | $ 41,800 | $ 41,200 |
Number of operating lease | item |  |  |  |  |  | 9
Operating lease, right-of-use asset | 89,615 |  |  | 89,615 |  | $ 60,006
Lease liability - operating lease | 89,437 |  |  | 89,437 |  | $ 56,762
Number of finance lease | item |  |  |  |  |  | 4
Finance lease, right-of-use asset | 25,086 |  |  | $ 25,086 |  | $ 102,055
Pro rata core leased occupancy rate percentage |  |  | 93.30% | 91.10% |  |
Pro rata fund leased occupancy rate percentage |  |  | 91.10% | 89.80% |  |
Number of sores having bankruptcies, in core portfolio | Store |  |  |  | 6 |  |
Core portfolio annualized base rents for stores of bankruptcies |  |  |  | $ 2,600 |  |
Core portfolio annualized base rents for stores of bankruptcies percentage |  |  |  | 1.90% |  |
Number of sores having bankruptcies, in fund portfolio | Store |  |  |  | 17 |  |
Fund portfolio annualized base rents for stores of bankruptcies |  |  |  | $ 1,100 |  |
Fund portfolio annualized base rents for stores of bankruptcies percentage |  |  |  | 5.20% |  |
COVID-19 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of rent concession agreements | Aqreement |  |  |  | 237 |  |
Number of rent concession agreements for rent deferral | Aqreement |  |  |  | 210 |  |
Number of rent concession agreements for rent abatements | Aqreement |  |  |  | 27 |  |
Number of rent concession agreements accounted as no change in contract | Aqreement |  |  |  | 203 |  |
Deferred receivables | 7,500 |  |  | $ 7,500 |  |
COVID-19 | Accounts Payable and Accrued Expenses |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Deferred lease payments | $ 100 |  |  | $ 100 |  |
565 Broadway | Core Portfolio |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | 4,900
Finance lease, right-of-use asset |  |  |  |  |  | 19,400
110 University Place |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | 45,300
Operating lease liabilities |  |  |  |  |  | 45,300
Capital Lease Liability |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Finance lease liabilities |  |  |  |  |  | 71,100
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 |  |  | 22 years |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | 11,900
Operating lease liabilities |  |  |  |  |  | $ 12,800
Number of finance lease | item |  |  |  |  |  | 3
Accounting Standards Update 2016-02 | 991 Madison Avenue Manhattan, NY |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Capital lease term |  |  |  | 49 years |  |
Operating Lease term | 15 years |  |  | 15 years |  |
Office Lease |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Number of operating lease | item |  |  |  | 1 |  |
Operating lease, right-of-use asset | $ 1,700 |  |  | $ 1,700 |  |
Lease liability - operating lease | $ 1,700 |  |  | $ 1,700 |  |
Ground, Office and Equipment Leases |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  |  |  | $ 82,600
Operating lease liabilities |  |  |  |  |  | 76,600
Capital Leases Asset |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Finance lease, right-of-use asset |  |  |  |  |  | $ 77,000
Minimum |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease term | 1 month |  |  | 1 month |  |
Maximum |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating lease term | 60 years |  |  | 60 years |  |

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