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Significant Transactions During the Six Months Ended June 30, 2019 and Subsequent Events (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 USD ($) apartment | May 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Jan. 31, 2019 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  | $ 86,000,000.0 |  | $ 290,000,000.0 |  |  |  |
Gain on remeasurement of co-investment |  |  |  | 31,500,000 |  |  | $ 0 | $ 0 | $ 31,535,000 | $ 0
Promote income |  |  |  | 800,000 |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  |  |  |  |  |  |  | 98,681,000 | 0
Gain on sale of real estate and land |  |  |  |  |  |  | 0 | 22,244,000 | 0 | 22,244,000
Proceeds from full redemption of a preferred equity investment in a joint venture |  |  |  |  | $ 10,900,000 |  |  |  |  |
Early redemption fee |  |  |  |  | 100,000 |  |  |  |  |
Shares repurchased during period (in shares) | shares |  |  |  |  |  | 234,061 |  |  |  |
Shares repurchased during period, value |  |  |  |  |  | $ 57,000,000.0 |  |  |  |
Purchase authority remaining under stock repurchase plan | $ 250,000,000.0 |  |  |  | 250,000,000.0 |  | 250,000,000.0 |  | 250,000,000.0 |
Debt, stated interest rate |  |  |  |  |  | 5.57% |  |  |  |
Gain on early retirement of debt, net |  |  |  |  |  | $ 1,400,000 | 332,000 | $ 0 | 1,668,000 | $ 0
Senior Notes [Member] | Unsecured Notes, 4.0% Interest Rate, Due March 2029 [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 150,000,000.0 |  |  |  | $ 350,000,000.0 |  | $ 150,000,000.0 |  | $ 150,000,000.0 |
Debt, stated interest rate |  |  |  |  | 4.00% |  |  |  |  |
Debt offering price, percentage of par value | 100.717% |  |  |  | 99.188% |  | 100.717% |  | 100.717% |
Brio, Walnut Creek, California [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment | 300 |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 164,900,000 |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition | 98,700,000 |  |  |  |  |  |  |  |  |
Multifamily Development in Mountain View, California [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  |  |  | $ 24,500,000 |  |  |  |  |
Preferred returns rate |  |  |  |  | 11.00% |  |  |  |  |
Multifamily Development Community in Irvine, California [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  |  | $ 36,000,000.0 |  |  |  |  |  |
Preferred returns rate |  |  |  | 10.15% |  |  |  |  |  |
Funded commitment amount | 12,000,000.0 |  |  |  |  |  | $ 12,000,000.0 |  | $ 12,000,000.0 |
Joint Venture that Holds Property in Santa Ana, California [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  |  | $ 16,300,000 |  |  |  |  |  |  |
Early redemption fee |  |  | 700,000 |  |  |  |  |  |  |
Multifamily Development In Oakland, California, 10.25% Rate [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  | $ 36,800,000 |  |  |  |  |  |  |
Preferred returns rate |  |  | 10.25% |  |  |  |  |  |  |
Funded commitment amount | 5,000,000.0 |  |  |  |  |  | 5,000,000.0 |  | 5,000,000.0 |
Multifamily Development In Oakland, California, 11.0% Rate [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  | $ 11,800,000 |  |  |  |  |  |  |
Preferred returns rate |  |  | 11.00% |  |  |  |  |  |  |
Funded commitment amount | $ 4,000,000.0 |  |  |  |  |  | $ 4,000,000.0 |  | $ 4,000,000.0 |
One South Market, San Jose, CA [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership interest in partnership investments |  |  |  | 45.00% |  |  |  |  |  |
Payments to joint venture interest |  |  |  | $ 80,600,000 |  |  |  |  |  |
Land Located in Oakland, California [Member] |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |
Limited partnership interest in partnership investments |  | 50.00% |  |  |  |  |  |  |  |
Proceeds from sale of real estate |  | $ 6,100,000 |  |  |  |  |  |  |  |
Gain on sale of real estate and land |  | $ 900,000 |  |  |  |  |  |  |  |

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