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Real Estate Activity - Schedule of Gain (Loss) on Sale or Write-down of Assets (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Aug. 26, 2021 USD ($) ft² | Jul. 16, 2020 USD ($) apartment | May 01, 2020 USD ($) apartment | Nov. 19, 2018 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Gain on sale or write-down of assets, net |  |  |  |  | $ 31,312,000 | $ 15,325,000 | $ 24,265,000 | $ 24,802,000
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Notes Assumed | $ 9,085,000 |  |  |  |  |  |  |
Cash Received From Sale Of Real Estate | $ 4,215,000 |  |  |  |  |  |  |
Las Colinas | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Area of property | ft² | 512,173 |  |  |  |  |  |  |
Proceeds from sale | $ 74,750,000 |  |  |  |  |  |  |
Gain on sale | $ 27,270,000 |  |  |  |  |  |  |
Villager | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale |  |  | $ 2,426,000 |  |  |  |  |
Gain on sale |  |  | $ 898,000 |  |  |  |  |
Number of units in real estate property | apartment |  |  | 33 |  |  |  |  |
Notes Assumed |  |  | $ 665,000 |  |  |  |  |
Villager | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Notes Receivable |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Notes receivable |  |  | $ 1,761,000 |  |  |  |  |
Farnham Park | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale |  | $ 13,300,000 |  |  |  |  |  |
Gain on sale |  | $ 2,684,000 |  |  |  |  |  |
Number of units in real estate property | apartment |  | 144 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Ownership interest sold |  |  |  | 50.00% |  |  |  |
Gain on sale |  |  |  | $ 154,100,000 |  |  |  |
Earn Out Obligation charge |  |  |  |  | 5,441,000 |  | $ 29,600,000 |
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, net |  |  |  |  | 4,042,000 | 5,774,000 | 15,153,000 | 15,248,000
Multifamily Properties |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Gain on sale or write-down of assets, net |  |  |  |  | 0 | 3,704,000 | 11,441,000 | 3,704,000
Commercial Properties |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |
Gain on sale or write-down of assets, net |  |  |  |  | 27,270,000 | 4,609,000 | 27,270,000 | 4,609,000
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, net |  |  |  |  | $ 0 | $ 1,238,000 | $ (29,599,000) | $ 1,241,000

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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e7008-128479 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2443-110228 + Details
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