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Significant Transactions During the Second Quarter of 2017 and Subsequent Event (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2017 | Jul. 27, 2017 | May 31, 2017 | Apr. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Proceeds from partial redemption of preferred equity investment in a joint venture |  |  |  |  |  |  | $ 67,674,000 | $ 34,564,000
Gain on early redemption of preferred equity investment |  |  |  |  |  |  | 0 | 13,046,000
Payments to acquire preferred equity investments |  |  |  |  |  |  | $ 12,750,000 | $ 0
Common stock issued under equity distribution program (in shares) |  |  |  |  |  | 311,873 |  |
Common stock issued under equity distribution program average price (in dollars per share) |  |  |  |  | $ 260.30 | $ 260.30 | $ 260.30 |
Sale of common stock, net |  |  |  |  |  | $ 80,600,000 | $ 80,565,000 |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Common stock issued under equity distribution program (in shares) |  | 0 |  |  |  |  |  |
Repaid amount of private placement | $ 40,000,000 |  |  |  |  |  |  |
Private placement repurchase, coupon rate (as a percent) | 4.50% |  |  |  |  |  |  |
Senior Notes [Member] | Senior Unsecured Notes At 3.625% [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 350,000,000 |  |  |  |
Debt, term (in years) |  |  |  | 10 years |  |  |  |
Debt, stated interest rate (as a percent) |  |  |  | 3.625% |  |  |  |
Limited Liability Company With Development Projects In The Jefferson At Stadium Park Apartments [Member] | Notes and Other Receivables from Affiliates [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Co-investments |  |  | $ 13,200,000 |  |  |  |  |
Preferred equity investment, dividend rate, first 30 months (as a percent) |  |  | 10.00% |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  | $ 4,000,000 |  |  |
Preferred Equity Investment in a Joint Venture that Holds a Property in Seattle, Washington [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Proceeds from partial redemption of preferred equity investment in a joint venture |  |  |  | $ 12,600,000 |  |  |  |
Reduction in preferred equity investment |  |  |  | 12,400,000 |  |  |  |
Gain on early redemption of preferred equity investment |  |  |  | $ 200,000 |  |  |  |
Preferred Equity Investment In Multifamily Development Project In Seattle, Washington [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Preferred equity investment, dividend rate, first 30 months (as a percent) | 11.00% |  |  |  |  |  |  |
Commitment to fund preferred equity investment in a multifamily development project located in Seattle, WA | $ 11,900,000 |  |  |  |  |  |  |

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