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Significant Transactions During the Nine Months Ended September 30, 2018 and Subsequent Events (Details) | 1 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 USD ($) unit apartment | Jun. 30, 2018 USD ($) unit | May 31, 2018 USD ($) apartment | Mar. 31, 2018 USD ($) | Jan. 31, 2018 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Promote income |  |  |  | $ 20,500,000 |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  | $ 26,500,000 |  |  | $ 2,400,000 |  |  |
Gain on early redemption of preferred equity investment |  | $ 1,600,000 |  |  |  |  |  |
Stock repurchased and retired during the period (in shares) | shares |  |  |  |  | 16,834 |  |  |
Stock repurchased and retired during the period |  |  |  |  | $ 3,800,000 |  |  |
Purchase authority remaining under stock repurchase plan |  |  |  |  |  | $ 245,200,000 | $ 245,200,000 |
Acquisitions of real estate |  |  |  |  |  |  | 7,807,000 | $ 200,028,000
Preferred equity investments |  |  |  |  |  |  | $ 100,202,000 | $ 231,552,000
Senior Notes [Member] | Senior Unsecured Notes At 4.500% [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 300,000,000 |  |  |  |
Debt, term (in years) |  |  |  | 30 years |  |  |  |
Debt, stated interest rate |  |  |  | 4.50% |  |  |  |
Domain [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Number of units sold | unit |  | 379 |  |  |  |  |  |
Proceeds from sale of real estate |  | $ 132,000,000 |  |  |  |  |  |
Gain (loss) on sale of properties |  | $ 22,200,000 |  |  |  |  |  |
Apartment Home Community In Ventura, California [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Commitment to fund preferred equity investment |  |  | $ 26,500,000 |  |  |  |  |
Number of units acquired | apartment |  |  | 400 |  |  |  |  |
Preferred returns rate |  |  | 10.25% |  |  |  |  |
Commitment funded amount |  |  |  |  |  | $ 20,600,000 |  |
BEX III [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Repayments of related party debt |  |  |  |  | $ 29,500,000 |  |  |
Meridian at Midtown [Member] | Wesco V [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Number of units acquired | unit | 218 |  |  |  |  |  |  |
Acquisitions of real estate | $ 104,000,000 |  |  |  |  |  |  |
Mortgage debt assumed in connection with the acquisition | $ 69,900,000 |  |  |  |  |  |  |
Effective interest rate of mortgage debt incurred as consideration | 4.50% |  |  |  |  |  |  |
Home Community Development in Burlingame, California [Member] | Subsequent Event [Member] | Affiliated Entity [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Number of units acquired | apartment | 268 |  |  |  |  |  |  |
Preferred returns rate | 12.00% |  |  |  |  |  |  |
Preferred equity investments | $ 18,600,000 |  |  |  |  |  |  |

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