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Nature of Business (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 segment | Sep. 30, 2021 USD ($) segment property | Sep. 22, 2021 property | Jul. 26, 2021 property | Dec. 31, 2020 USD ($)
Properties Sold and Held for Sale [Line Items] |  |  |  |  |
Number of reportable segments | segment | 2 | 1 |  |  |
TRSs |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |
Deferred tax asset | $ |  | $ 1.4 |  |  | $ 1.4
Deferred tax valuation allowance | $ |  | $ 1.4 |  |  | $ 1.4
Office |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |
Number of properties held for sale | property |  | 12 |  | 12 |
Retail |  |  |  |  |
Properties Sold and Held for Sale [Line Items] |  |  |  |  |
Number of properties held for sale | property |  | 8 | 8 |  |

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