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Significant Transactions During the Nine Months Ended September 30, 2019 and Subsequent Events (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Oct. 25, 2019 USD ($) | Sep. 30, 2019 USD ($) apartment $ / shares | Aug. 31, 2019 USD ($) apartment | Jun. 30, 2019 USD ($) apartment | May 31, 2019 USD ($) | Apr. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Feb. 28, 2019 USD ($) | Jan. 31, 2019 USD ($) shares | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Aug. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of secured debt |  | $ 289,100,000 |  |  |  |  |  |  | $ 290,000,000.0 |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 31,535,000 | $ 0 |  |
Debt assumed in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  | 143,006,000 | 0 |  |
Gain on sale of real estate and land |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 22,244,000 |  |
Ownership interest of initial equity commitment |  | 1,413,861,000 |  |  |  |  |  |  |  | 1,413,861,000 |  | 1,413,861,000 |  |  | $ 1,300,140,000
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 |  |  |
Sale of common stock, net |  |  |  |  |  |  |  |  |  | $ 72,631,000 | (130,000) | $ 72,549,000 | (483,000) |  |
Senior unsecured debt of coupon rate |  | 5.69% |  |  |  |  |  |  | 5.57% | 5.69% |  | 5.69% |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  |  |  |  |  | $ 892,762,000 | 298,773,000 |  |
Gain on early retirement of debt, net |  | $ 5,500,000 |  |  |  |  |  |  | $ 1,400,000 | $ 5,475,000 | $ 0 | $ 7,143,000 | $ 0 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture | $ 15,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption fee | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Unsecured Notes, 4.0% Interest Rate, Due March 2029 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partner issued senior unsecured debt notes |  |  |  |  |  |  | $ 150,000,000.0 | $ 350,000,000.0 |  |  |  |  |  |  |
Senior unsecured debt of coupon rate |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |
Debt offering price, percentage of par value |  |  |  |  |  |  | 100.717% | 99.188% |  |  |  |  |  |  |
Senior Notes [Member] | Unsecured Notes, 3.0% Interest Rate, Due January 2030 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating partner issued senior unsecured debt notes |  |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Senior unsecured debt of coupon rate |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt offering price, percentage of par value |  |  | 98.632% |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Unsecured Notes, 3.000% Interest Rate, Due January 2020 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 150,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt offering price, percentage of par value | 101.685% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of common stock, net (in shares) | shares |  |  |  |  |  |  |  |  |  | 228,000 |  | 228,271 |  |  |
Common stock dividends (in dollars per share) | $ / shares |  | $ 321.56 |  |  |  |  |  |  |  | $ 321.56 |  | $ 321.56 |  |  |
Sale of common stock, net |  |  |  |  |  |  |  |  |  |  |  | $ 73,400,000 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Wesco V, LLC (Wesco V), Emeryville [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  | 331 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 178,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  | $ 89,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Wesco V, LLC (Wesco V), Emeryville [Member] | Loan of (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan of the Company with an interest rate of LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.30% |
BEX IV, LLC (BEX IV), Menlo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  | 195 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  |  | $ 148,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  |  | $ 44,400,000 |  |  |  |  |  |  |  |  |  |  |  |
BEX IV, LLC (BEX IV), Menlo Park [Member] | Loan of (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan of the Company with an interest rate of LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |
Redwood City [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 132 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate |  | $ 88,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of company assumed mortgage debt |  | 44,300,000 |  |  |  |  |  |  |  | $ 44,300,000 |  | 44,300,000 |  |  |
BEX IV,Ownership Interest In The Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partnership interest in partnership investments |  |  | 50.10% |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of initial equity commitment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,200,000 |
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% |  |  |  |  |  |  |
San Jose, CA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  |  |  |  |  |  |  | $ 10,900,000 |  |  |  |  |  |  |
Early redemption fee |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
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 |  | 21,600,000 |  |  |  |  |  |  |  | 21,600,000 |  | 21,600,000 |  |  |
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 |  | 15,000,000.0 |  |  |  |  |  |  |  | 15,000,000.0 |  | 15,000,000.0 |  |  |
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 |  | 5,500,000 |  |  |  |  |  |  |  | 5,500,000 |  | 5,500,000 |  |  |
Redmond, WA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  | 14,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption fee |  | 300,000 |  |  |  |  |  |  |  | 300,000 |  | 300,000 |  |  |
Seattle, WA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from full redemption of a preferred equity investment in a joint venture |  | 16,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption fee |  | $ 1,400,000 |  |  |  |  |  |  |  | $ 1,400,000 |  | $ 1,400,000 |  |  |
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 |  |  |  |  |  |  |  |
Repayments of secured debt |  |  |  |  |  |  | 86,000,000.0 |  |  |  |  |  |  |  |
Gain on remeasurement of co-investment |  |  |  |  |  |  | 31,500,000 |  |  |  |  |  |  |  |
Promote income |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |
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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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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- Definition Cash received for the sale of real estate that is not part of an investing activity during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Definition The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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