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Real Estate Activity - Schedule of Gain (Loss) on Sale or Write-down of Assets (Details) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 26, 2021 USD ($) ft² | Jul. 16, 2020 USD ($) apartment | May 01, 2020 USD ($) apartment | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Gain on sale or write-down of assets |  |  |  |  | $ 24,647 | $ 36,895 | $ 15,192
Overlook At Allensville Phase II Apartments |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Ownership interest sold |  |  |  |  | 50.00% |  |
Macquarie Group |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  |  |  | $ 5,441 | $ 29,600 |  |
Sold |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Assumption value of the mortgage note payable |  | $ 9,085 |  |  |  |  |
Cash received |  | 4,215 |  |  |  |  |
Land |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Gain on sale or write-down of assets |  |  |  |  | 16,645 | 25,171 | 14,889
Multifamily |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Gain on sale or write-down of assets |  |  |  |  | 10,405 | 3,702 | (80)
Commercial |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Gain on sale or write-down of assets |  |  |  |  | 27,196 | 4,610 | 0
Other |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Gain on sale or write-down of assets |  |  |  |  | $ (29,599) | $ 3,412 | $ 383
Las Colinas | Sold |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Area of real estate property | ft² | 512,173 |  |  |  |  |  |
Proceeds from sale | $ 74,750 |  |  |  |  |  |
Gain on sale | $ 27,270 |  |  |  |  |  |
Villager | Sold |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 2,426 |  |  |  |
Gain on sale |  |  | $ 898 |  |  |  |
Number of units in real estate property | apartment |  |  | 33 |  |  |  |
Assumption value of the mortgage note payable |  |  | $ 665 |  |  |  |
Villager | Sold | Notes Receivable |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  | $ 1,761 |  |  |  |
Farnham Park | Sold |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |
Proceeds from sale |  | 13,300 |  |  |  |  |
Gain on sale |  | $ 2,684 |  |  |  |  |
Number of units in real estate property | apartment |  | 144 |  |  |  |  |

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