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Leases - Additional Information (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2019 item | Sep. 30, 2020 USD ($) item | Jun. 30, 2020 item | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) item
Operating Leased Assets [Line Items] |  |  |  |  |
Variable lease revenues |  |  |  | $ 57,700,000 |
Number of operating lease | item |  |  |  |  | 9
Lease liability - operating lease |  |  |  | 88,816,000 | $ 56,762,000
Lease agreement purchase price |  |  |  | 14,500 |
Operating lease right-of-use asset |  |  |  | 76,268,000 | $ 60,006,000
Number of finance lease | item |  |  |  |  | 4
Finance lease, right-of-use asset |  |  |  | 25,086,000 | $ 102,055,000
565 Broadway | Core Portfolio |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  | 4,900,000
Finance lease, right-of-use asset |  |  |  |  | 19,400,000
110 University Place |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  | 45,300,000
Operating lease liability |  |  |  |  | 45,300,000
Capital Lease Liability |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Finance lease liabilities |  |  |  |  | 71,100,000
Fund IV Property |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Impairment charge of right-of-use asset |  |  |  | $ 12,300,000 |
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 |
1238 Wisconsin |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Lease agreement purchase price |  |  |  | $ 11,500 |
Operating lease right-of-use asset |  |  |  | 1,900 |
Operating lease liability |  |  |  | $ 1,900 |
Accounting Standards Update 2016-02 |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  | 11,900,000
Operating lease liability |  |  |  |  | 12,800,000
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 |  |
Office Lease |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Number of operating lease | item |  | 1 |  |  |
Lease liability - operating lease |  | $ 1,700 |  |  |
Ground, Office and Equipment Leases |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease right-of-use asset |  |  |  |  | 82,600,000
Operating lease liability |  |  |  |  | 76,600,000
Capital Leases Asset |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Finance lease, right-of-use asset |  |  |  |  | $ 77,000,000.0
Minimum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease term |  |  |  | 1 month |
Maximum |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |
Operating lease term |  |  |  | 60 years |

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