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Significant Transactions During the Nine Months Ended September 30, 2021 and Subsequent Events (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 27, 2021 USD ($) apartment | Sep. 30, 2021 USD ($) commercial_lease apartment | Aug. 31, 2021 USD ($) apartment | Jun. 30, 2021 USD ($) apartment | Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) apartment | Jan. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  | $ 2,260,000 | $ 234,694,000 |
Revenue from disposition |  |  |  |  |  |  |  | 2,237,000 |  | 2,347,000 |  |  | 6,707,000 | 7,312,000 |
Co-investments |  | $ 1,052,824,000 |  |  |  |  |  | 1,052,824,000 |  |  |  | $ 1,052,824,000 | 1,052,824,000 |  | $ 1,018,010,000
Commitments to acquire equity method investment |  | $ 26,200,000 | $ 11,000,000 |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |
Preferred return rate |  | 12.50% | 11.50% |  |  |  | 10.00% |  |  |  |  |  |  |  |
Notes receivable, early redemption fee received |  |  |  |  |  |  |  |  |  |  |  |  | 4,747,000 | 0 |
Shares repurchased during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Note receivable, secured, bearing interest at 11.00%, due October 2023 (Originated April 2020) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from redemption of notes receivable |  |  |  | $ 36,500,000 |  |  |  |  |  |  |  |  |  |  |
Notes receivable, early redemption fee received |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Mezzanine Loans | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable with imputed interest, face amount |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |
Receivable with imputed interest, effective yield (interest rate) |  |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |
Option to extend |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Affiliated Entity | Related party bridge loan - Wesco VI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  | $ 29,200,000 |  |  |  |  |  | 29,200,000 |  |  |  | $ 29,200,000 | 29,200,000 |  |
Interest rate |  | 2.15% |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Related party bridge loan - Wesco I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  | $ 52,500,000 |  |  |  | $ 52,500,000 |  |  |  |  |  |
Interest rate |  |  |  |  | 2.55% |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased and retired during period (in shares) | shares |  |  |  |  |  |  |  |  | 40,000 |  |  |  |  |  |
Shares repurchased and retired during period, value |  |  |  |  |  |  |  |  | $ 9,200,000 |  |  |  |  |  |
Purchase authority remaining under stock repurchase plan |  | $ 214,500,000 |  |  |  |  |  | 214,500,000 |  |  |  | 214,500,000 | 214,500,000 |  |
Stock repurchase plan amount |  | 250,000,000 |  |  |  |  |  | 250,000,000 |  |  |  | 250,000,000 | 250,000,000 |  |
Commercial Property 7 South Linden, South San Francisco, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 33,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of commercial leases | commercial_lease |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Wesco VI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest in partnership investments |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Co-investments |  | $ 150,000,000 |  |  |  |  |  | 150,000,000 |  |  |  | $ 150,000,000 | 150,000,000 |  |
Commercial Property Third & Broad, Seattle, WA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | 52,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Equity Investment Property in Northern California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  | $ 21,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred Equity Investment Property in Southern California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |
Joint Venture That Holds Property in Southern California |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  |  |  | 110,200,000 |  |  |  |  |  |  |  |  |  |
Early redemption fee |  |  |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |
Essex Portfolio, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  |  |  | 0 |  | 0 |  |  | 2,260,000 | 234,694,000 |
Revenue from disposition |  |  |  |  |  |  |  | $ 2,237,000 |  | $ 2,347,000 |  |  | 6,707,000 | 7,312,000 |
Notes receivable, early redemption fee received |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,747,000 | $ 0 |
Essex Portfolio, L.P. | Senior Notes | 2028 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  | $ 450,000,000 |  |  |  | $ 450,000,000 |  |  |  |  |  |
Interest rate |  |  |  |  | 1.70% |  |  |  | 1.70% |  |  |  |  |  |
Debt offering price, percentage of par value |  |  |  |  | 99.423% |  |  |  | 99.423% |  |  |  |  |  |
Essex Portfolio, L.P. | Senior Notes | 2031 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.55% |  |  |  |  |  |  |  |  |  |  |
Debt offering price, percentage of par value |  |  |  | 99.367% |  |  |  |  |  |  |  |  |  |  |
Essex Portfolio, L.P. | Senior Notes | 2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.375% |  |  |  |  |  |  |  |  |  |  |
The Village at Toluca Lake | Joint Venture Partner, BEX III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 31,800,000 |  |  |  |  |  |  |  |  |  |  |
Investment interest acquired |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 29,500,000 |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |
The Village at Toluca Lake | Apartment Building | Joint Venture Partner, BEX III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  | 145 |  |  |  |  |  |  |  |  |  |  |
Devonshire, Hemet, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from disposition |  |  | 54,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  | $ 42,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Devonshire, Hemet, CA | Apartment Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units | apartment |  |  | 276 |  |  |  |  |  |  |  |  |  |  |  |
Hidden Valley, Simi Valley, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  |  | $ 29,700,000 |  |  |  |  |  |  |  |  |
Revenue from disposition |  |  |  |  |  | 105,000,000 |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  | $ 69,200,000 |  |  |  |  |  |  |  |  |
Hidden Valley, Simi Valley, CA | Apartment Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units | apartment |  |  |  |  |  | 324 |  |  |  |  |  |  |  |  |
Park 20, San Mateo, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from disposition |  |  |  |  |  | $ 113,000,000 |  |  |  |  |  |  |  |  |
Park 20, San Mateo, CA | Apartment Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units | apartment |  |  |  |  |  | 197 |  |  |  |  |  |  |  |  |
Axis 2300, Irvine, CA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from disposition |  |  |  |  |  | $ 57,500,000 |  |  |  |  |  |  |  |  |
Gain on sale of properties |  |  |  |  |  | $ 30,800,000 |  |  |  |  |  |  |  |  |
Axis 2300, Irvine, CA | Apartment Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of apartment units | apartment |  |  |  |  |  | 115 |  |  |  |  |  |  |  |  |
Martha Lake Apartment | Wesco VI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 53,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Martha Lake Apartment | Apartment Building | Wesco VI, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 155 |  |  |  |  |  |  |  |  |  |  |  |  |
Monterra in Mill Creek | Wesco VI, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 55,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monterra in Mill Creek | Apartment Building | Wesco VI, LLC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment | 139 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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