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Real Estate Investments - Sales of Real Estate Investments (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) apartment | Mar. 31, 2021 USD ($) apartment | Dec. 31, 2021 USD ($) community | Dec. 31, 2020 USD ($) apartment community | Dec. 31, 2019 USD ($) land_parcel
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment |  |  |  | 439 |
Total property revenues | $ 330,000 |  | $ 9,138 | $ 9,598 | $ 9,527
Proceeds from sale of real estate |  |  |  | 343,500 | 23,300
Gain (loss) on sale of properties |  |  |  | $ 65,000 | $ (3,200)
Number of land parcels sold | land_parcel |  |  |  |  | 2
Apartment communities owned (in communities) | community |  |  | 252 | 2 |
Hidden Valley, Simi Valley, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Total property revenues |  | $ 105,000 |  |  |
Gain (loss) on sale of properties |  | 69,200 |  |  |
Repayments of debt |  | 29,700 |  |  |
Park 20, San Mateo, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Total property revenues |  | 113,000 |  |  |
Axis 2300, Irvine, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Total property revenues |  | 57,500 |  |  |
Gain (loss) on sale of properties |  | $ 30,800 |  |  |
Devonshire, Hemet, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Total property revenues | 54,500 |  |  |  |
Gain (loss) on sale of properties | $ 42,900 |  |  |  |
Apartment Building |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment | 912 |  |  | 670 |
Number of communities sold | community |  |  |  | 4 |
Apartment Building | Hidden Valley, Simi Valley, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment |  | 324 |  |  |
Apartment Building | Park 20, San Mateo, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment |  | 197 |  |  |
Apartment Building | Axis 2300, Irvine, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment |  | 115 |  |  |
Apartment Building | Devonshire, Hemet, CA |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |
Number of apartment units | apartment | 276 |  |  |  |

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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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