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Leases - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) Aqreement | Jun. 30, 2020 USD ($) Aqreement | Mar. 31, 2020 | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) item Store | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) item | Apr. 30, 2020
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Variable lease revenues |  | $ 12,800 |  | $ 13,200 | $ 27,300 | $ 26,600 |  |
Number of operating lease | item |  |  |  |  | 1 |  | 9 |
Operating lease, right-of-use asset | $ 88,964 | 88,964 |  |  | $ 88,964 |  | $ 60,006 |
Number of finance lease | item |  |  |  |  |  |  | 4 |
Finance lease, right-of-use asset | $ 25,086 | $ 25,086 |  |  | 25,086 |  | $ 102,055 |
Reserves for collection charges |  |  |  |  | 15,900 |  |  |
Net investment, in lease estimated future credit losses expense reversal cares act |  |  |  |  | $ 12,900 |  |  |
Pro rata core leased occupancy rate percentage |  |  | 93.90% |  | 93.30% |  |  |
Pro rata fund leased occupancy rate percentage |  |  | 93.20% |  | 91.10% |  |  |
Number of sores having bankruptcies, in core portfolio | Store |  |  |  |  | 11 |  |  |
Core portfolio annualized base rents for stores of bankruptcies |  |  |  |  | $ 2,000 |  |  |
Core portfolio annualized base rents for stores of bankruptcies percentage |  |  |  |  | 1.40% |  |  |
Number of sores having bankruptcies, in fund portfolio | Store |  |  |  |  | 17 |  |  |
Fund portfolio annualized base rents for stores of bankruptcies |  |  |  |  | $ 400 |  |  |
Fund portfolio annualized base rents for stores of bankruptcies percentage |  |  |  |  | 1.80% |  |  |
COVID-19 |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Percentage of base rents derived from opened businesses | 74.00% | 74.00% |  |  | 74.00% |  |  | 38.00%
Percentage of rents billed | 83.00% | 83.00% |  |  | 83.00% |  |  | 50.00%
Percentage of rents and billed for fund portfolio | 62.00% | 62.00% |  |  | 62.00% |  |  |
Number of rent concession agreements | Aqreement | 98 | 98 |  |  |  |  |  |
Number of rent concession agreements for rent deferral | Aqreement |  | 92 |  |  |  |  |  |
Number of rent concession agreements for rent forgiveness | Aqreement |  | 6 |  |  |  |  |  |
Number of rent concession agreements accounted as no change in contract | Aqreement |  | 91 |  |  |  |  |  |
Reduction in rental income |  | $ 800 |  |  | $ 800 |  |  |
COVID-19 | Accounts Receivable |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Deferred receivables | $ 3,000 | 3,000 |  |  | 3,000 |  |  |
COVID-19 | Accounts Payable and Accrued Expenses |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Deferred lease payments | $ 100 | $ 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 |
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 |
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 |  |  | 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 |  |  | 15 years |  |  |
Minimum |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease term | 1 month | 1 month |  |  | 1 month |  |  |
Maximum |  |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |  |
Operating lease term | 60 years | 60 years |  |  | 60 years |  |  |

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