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Significant Transactions During The Six Months Ended June 30, 2020 and Subsequent Events (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2020 USD ($) apartment | Jun. 30, 2020 USD ($) community | Apr. 30, 2020 USD ($) extension | Mar. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) community apartment | Jun. 30, 2020 USD ($) shares | Mar. 31, 2020 USD ($) investment shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) community apartment | Jun. 30, 2019 USD ($) | Feb. 29, 2020 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  | $ 0 |  | $ 0 | $ 234,694,000 | $ 31,535,000 |
Revenue from disposition |  |  |  |  |  | 2,348,000 |  | 2,260,000 | 4,965,000 | 4,595,000 |
Number of preferred equity method investments | investment |  |  |  |  |  |  | 2 |  |  |  |
Commitments to acquire equity method investment |  |  |  |  |  |  | $ 91,400,000 |  |  |  |
Preferred return rate |  |  |  |  |  |  | 11.30% |  |  |  |
Funding amount to commitment of investment in mezzanine loan |  |  |  |  |  |  |  |  | 6,669,000 | 0 |
Senior Notes | 2032 Notes |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  | $ 150,000,000.0 |  |  |  | $ 150,000,000.0 |  |  | $ 150,000,000.0 |  |
Debt offering price, percentage of par value |  | 105.66% |  |  |  | 105.66% |  |  | 105.66% |  |
Reoffer yield percentage |  |  |  |  |  |  |  |  | 2.093% |  |
Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |
Number of extension options (in extensions) | extension |  |  | 2 |  |  |  |  |  |  |  |
Extension period |  |  | 12 months |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares repurchased during period (in shares) | shares |  |  |  |  |  | 87,988 | 776,261 |  |  |  |
Shares repurchased during period, value |  |  |  |  |  | $ 20,100,000 | $ 176,300,000 |  |  |  |
Purchase authority remaining under stock repurchase plan |  | $ 229,900,000 |  |  |  | 229,900,000 |  |  | $ 229,900,000 |  |
Stock repurchase plan amount |  | 250,000,000.0 |  |  |  | 250,000,000.0 |  |  | $ 250,000,000.0 |  |
CPPIB interest |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment interest acquired |  |  |  |  | 45.00% |  |  |  |  |  |
Value of property held by acquired investment |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  | 234,700,000 |  |  |  |  |  |
Promote income |  |  |  |  | 6,500,000 |  |  |  |  |  |
Joint venture that holds property in Los Angeles, CA |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  |  | $ 11,300,000 |  |  |  |  |  |  |
Early redemption fee |  |  |  | 200,000 |  |  |  |  |  |  |
Property Located in Anaheim, California |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from redemption of notes receivable |  |  |  |  | $ 16,900,000 |  |  |  |  |  |
Multifamily Development Communities in Los Angeles, California |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes receivable, commitment to fund, amount |  |  |  | $ 15,000,000.0 |  |  | $ 15,000,000.0 |  |  |  |
Notes receivable, interest rate |  |  |  | 10.50% |  |  | 10.50% |  |  |  |
Notes receivable, term of extension option |  |  |  | 2 years |  |  |  |  |  |  |
Multifamily Development Communities in Sacramento, California |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notes receivable, commitment to fund, amount |  |  |  | $ 29,200,000 |  |  | $ 29,200,000 |  |  |  |
Notes receivable, interest rate |  |  |  | 11.00% |  |  | 11.00% |  |  |  |
Notes receivable, term of extension option |  |  |  | 2 years |  |  |  |  |  |  |
Funding amount to commitment of investment in mezzanine loan |  |  | $ 6,700,000 |  |  |  |  |  |  |  |
Apartment Building | CPPIB interest |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities held by acquired investment | community |  |  |  |  | 6 |  |  |  |  |  |
Number of units held by acquired investment | apartment |  |  |  |  | 2,020 |  |  |  |  |  |
Apartment Building | One South Market, Museum Park |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of communities held by acquired investment | community |  |  |  |  |  |  |  |  | 1 |  |
Number of units held by acquired investment | apartment |  |  |  |  |  |  |  |  | 126 |  |
Essex Portfolio, L.P. |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  | 0 |  | 0 | $ 234,694,000 | 31,535,000 |
Revenue from disposition |  |  |  |  |  | $ 2,348,000 |  | $ 2,260,000 | 4,965,000 | 4,595,000 |
Funding amount to commitment of investment in mezzanine loan |  |  |  |  |  |  |  |  | 6,669,000 | $ 0 |
Essex Portfolio, L.P. | Senior Notes | 2032 Notes |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Debt coupon rate |  |  |  |  |  |  |  |  |  |  | 2.65%
Debt offering price, percentage of par value |  |  |  |  |  |  |  |  |  |  | 99.628%
Repayments of secured debt |  |  |  |  |  |  |  |  | $ 100,300,000 |  |
Affiliated Entity | Related party bridge loan - Wesco V |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from redemption of notes receivable |  |  |  |  | $ 85,800,000 |  |  |  |  |  |
LIBOR | Unsecured Term Loan |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.20% |  |  |  |  |  |  |  |
One South Market and Museum Park |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from disposition |  | 232,000,000.0 |  |  |  |  |  |  |  |  |
Gain (loss) on sale of properties |  | $ 16,600,000 |  |  |  |  |  |  |  |  |
One South Market and Museum Park | Apartment Building |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of units sold | community |  | 2 |  |  |  |  |  |  |  |  |
Subsequent Event | Apartment Building | Delano, Redmond, WA |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of units held by acquired investment | apartment | 126 |  |  |  |  |  |  |  |  |  |
Subsequent Event | One South Market and Museum Park |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from disposition | $ 51,500,000 |  |  |  |  |  |  |  |  |  |

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