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Related Party Transactions (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) unit | Mar. 31, 2018 USD ($) investment | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2015 USD ($) investment | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Management and other fees from affiliates |  |  | $ 3,200 | $ 3,000 |  |  |
Development and redevelopment fees |  |  | 900 | 800 |  |  |
Co-investments |  |  | 1,290,957 |  | $ 1,155,984 |  |
Payments to acquire preferred equity investments |  |  | $ 56,020 | 120,816 |  |  |
Equity investment, redeemed amount |  |  |  |  | 5,000 |  |
Number of equity method investments scheduled to mature | investment |  |  | 2 |  |  |  |
Short-term loans outstanding and due from various joint ventures |  |  | $ 3,300 |  | 5,100 |  |
Affiliated Entity [Member] | BEX III [Member] | Secured Note Receivable, 3.5% Interest Rate, Due March 9, 2018 [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Notes receivable | $ 29,500 |  |  |  |  |  |
Note receivable, related party, interest rate | 3.50% |  |  |  |  |  |
Limited Liability Company [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payments to acquire preferred equity investments |  |  |  |  |  | $ 20,000 |
Number of preferred equity method investments acquired during period (in investments) | investment |  |  |  |  |  | 3 |
Preferred stock, stated interest percentage |  |  |  |  |  | 9.50% |
Limited Liability Company [Member] | Marcus and Millichamp Company TMMC Affiliate [Member] | Secured Note Receivable, 9.5% Interest Rate, Due October 2019 [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  | $ 6,600 |  | $ 6,700 |  | $ 6,600
Membership Interest In Sage At Cupertino [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Co-investments |  | $ 15,300 |  | 15,300 |  |  |
Number of units acquired | unit |  | 230 |  |  |  |  |
Equity method investment, ownership percentage acquired |  | 40.50% |  |  |  |  |
Contract price |  | $ 90,000 |  |  |  |  |
Mortgage encumbrance |  | $ 52,000 |  | $ 52,000 |  |  |

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