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Related Party Transactions (Details) | 1 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2018 | Oct. 31, 2018 USD ($) apartment | May 31, 2018 USD ($) apartment | Nov. 30, 2017 USD ($) | Aug. 31, 2017 USD ($) | Mar. 31, 2017 USD ($) unit | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) unit | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) investment | Nov. 30, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Management and other fees from affiliates |  |  |  |  |  |  |  | $ 13,900,000 | $ 12,600,000 | $ 12,400,000 |  |
Revenues from development and redevelopment fees |  |  |  |  |  |  |  | 4,800,000 | 3,000,000 | 4,200,000 |  |
Notes receivable |  |  |  |  |  |  | $ 71,895,000 | 71,895,000 | 100,926,000 |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  | $ 162,437,000 | 293,363,000 | 183,989,000 |  |
Number of units acquired | unit |  |  |  |  |  |  |  | 166 |  |  |  |
Annualized preferred return rate | 9.90% |  |  |  |  |  |  |  |  |  |  |
Co-investments |  |  |  |  |  |  | 1,300,140,000 | $ 1,300,140,000 | 1,155,984,000 |  |  |
Encumbrance |  |  |  |  |  |  | 1,806,626,000 | 1,806,626,000 |  |  |  |
Redeemed equity method investment |  |  |  |  |  |  |  |  | 5,000,000 |  |  |
Apartment Home Community In Ventura, California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  | 400 |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  |  | 10.25% |  |  |  |  |  |  |  |  |
Preferred equity investment, commitment to fund |  |  | $ 26,500,000 |  |  |  |  |  |  |  |  |
Purchase commitment, funded amount |  |  |  |  |  |  | 21,000,000 |  |  |  |  |
Membership Interest In Sage At Cupertino [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | unit |  |  |  |  |  | 230 |  |  |  |  |  |
Co-investments |  |  |  |  |  | $ 15,300,000 |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 40.50% |  |  |  |  |  |
Contract price |  |  |  |  |  | $ 90,000,000 |  |  |  |  |  |
Encumbrance |  |  |  |  |  | $ 52,000,000 |  |  |  |  |  |
Notes And Other Receivables From Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  | 4,500,000 | 4,500,000 | 5,100,000 |  |  |
Related party note receivable, secured, bearing interest at 9.5%, due October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  | 6,618,000 | 6,618,000 | 6,656,000 |  |  |
Secured Note Receivable, 3.5% Interest Rate, Due December 16, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  | 0 | 0 | 29,500,000 |  |  |
Marcus and Millichamp Company TMMC Affiliate [Member] | Related party note receivable, secured, bearing interest at 9.5%, due October 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  |  |  |  | $ 6,600,000
Marcus and Millichamp Company TMMC Affiliate [Member] | Disposition Of Multi-family Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for brokerage fees |  |  |  |  |  |  |  | 0 | 0 | $ 1,100,000 |  |
Limited Liability Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |
Number of equity method investments acquired during the period | investment |  |  |  |  |  |  |  |  |  |  | 3 |
Cumulative dividend rate |  |  |  |  |  |  |  |  |  |  | 9.50% |
Limited Liability Company [Member] | Related party note receivable, secured, bearing interest at 9.5%, due October 2019 [Member] | Marcus and Millichamp Company TMMC Affiliate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  |  |  | 6,600,000 | 6,600,000 | $ 6,700,000 |  |  |
Affiliated Entity [Member] | Home Community Development in Burlingame, California [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investments |  | $ 18,600,000 |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 268 |  |  |  |  |  |  |  |  |  |
Annualized preferred return rate |  | 12.00% |  |  |  |  |  |  |  |  |  |
Affiliated Entity [Member] | Secured Note Receivable, 3.5% Interest Rate, Due December 16, 2017 [Member] | Wesco V Property [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable, related parties |  |  |  |  | $ 55,000,000 |  |  |  |  |  |  |
Notes receivable, related party, interest rate |  |  |  |  | 3.50% |  |  |  |  |  |  |
Affiliated Entity [Member] | Secured Note Receivable, 3.5% Interest Rate, Due March 9, 2018 [Member] | BEX III [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |
Notes receivable, related parties |  |  |  | $ 29,500,000 |  |  |  |  |  |  |  |
Notes receivable, related party, interest rate |  |  |  | 3.50% |  |  |  |  |  |  |  |

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