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Real Estate Investments - Co-Investments (Details) | 1 Months Ended | 12 Months Ended |  |
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Dec. 31, 2019 USD ($) | Nov. 30, 2019 USD ($) apartment | Oct. 31, 2019 USD ($) apartment | Aug. 31, 2019 USD ($) apartment | Dec. 31, 2019 USD ($) unit | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 01, 2019 | Aug. 01, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Promote interest earned |  |  |  | $ 52,200,000 |  |  |  |  |
Number of units acquired | unit |  |  |  |  | 849 |  |  |  |
Purchase price |  |  |  |  | $ 373,300,000 | $ 35,400,000 |  |  |
Debt assumed in connection with acquisition |  |  |  |  | 143,006,000 | 45,804,000 | $ 51,882,000 |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | $ 1,335,339,000 |  |  |  | 1,335,339,000 | 1,300,140,000 |  |  |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |  |  |  |  |
Rental properties and real estate under development | 546,075,000 |  |  |  | 546,075,000 | 454,629,000 |  |  |
Other liabilities | 36,565,000 |  |  |  | 36,565,000 | 33,375,000 |  |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  | (217,339,000) | (220,492,000) | (222,894,000) |  |
General and administrative |  |  |  |  | (54,262,000) | (53,451,000) | (41,385,000) |  |
Equity income from co-investments |  |  |  |  | 112,136,000 | 89,132,000 | 86,445,000 |  |
Investments with Related Parties |  |  |  |  |  |  |  |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |  |  |
Equity income from co-investments |  |  |  |  | $ 7,500,000 | 2,000,000.0 | 1,900,000 |  |
BEX IV |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 50.10% |  |  |  |  |
Debt assumed in connection with acquisition | 44,400,000 |  |  |  |  |  |  |  |
BEX IV, LLC (BEX IV), Menlo Park |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  | 195 |  |  |  |  |
Purchase price |  |  |  | $ 148,000,000.0 |  |  |  |  |
Debt assumed in connection with acquisition |  |  |  | $ 44,400,000 |  |  |  |  |
Wesco V, LLC (Wesco V), Emeryville |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  | 331 |  |  |  |  |
Purchase price |  |  |  | $ 178,000,000.0 |  |  |  |  |
Debt assumed in connection with acquisition | 89,000,000.0 |  |  | $ 89,000,000.0 |  |  |  |  |
Canadian Pension Plan Investment Board (CPPIB or CPP), San Francisco, CA |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 55.00% |  |  |  |  |  |
Number of units acquired | apartment |  |  | 463 |  |  |  |  |  |
Gain on sale of properties |  |  | $ 50,200,000 |  |  |  |  |  |
Canadian Pension Plan Investment Board (CPPIB or CPP), San Francisco, CA | Rental and Other Property |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Total property revenues |  |  | $ 311,000,000.0 |  |  |  |  |  |
Velo & Ray Apartments, Seattle, WA |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of units acquired | apartment |  | 308 |  |  |  |  |  |  |
Purchase price |  | $ 133,000,000.0 |  |  |  |  |  |  |
Debt assumed in connection with acquisition |  | $ 85,500,000 |  |  |  |  |  |  |
CPPIB |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 55.00% |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 345,466,000 |  |  |  | $ 345,466,000 | 482,507,000 |  |  |
Wesco I, III, IV and V |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 51.00% |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 216,756,000 |  |  |  | $ 216,756,000 | 194,890,000 |  |  |
BEXAEW, BEX II, BEX III, and BEX IV |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 160,888,000 |  |  |  | $ 160,888,000 | 121,780,000 |  |  |
Other |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 48.00% |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 20,351,000 |  |  |  | $ 20,351,000 | 34,093,000 |  |  |
Total Operating Co-investments |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 743,461,000 |  |  |  | $ 743,461,000 | 833,270,000 |  |  |
Total Development Co-Investments |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  | 50.00% |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 146,944,000 |  |  |  | $ 146,944,000 | 94,060,000 |  |  |
Total Preferred Interest Investments |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 444,934,000 |  |  |  | 444,934,000 | 372,810,000 |  |  |
Total Preferred Interest Investments | Investments in Majority-Owned Subsidiaries |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures | 73,200,000 |  |  |  | 73,200,000 | 51,800,000 |  |  |
Total Co Investment |  |  |  |  |  |  |  |  |
Membership Combined Balance Sheets [Abstract] |  |  |  |  |  |  |  |  |
Rental properties and real estate under development | 4,733,762,000 |  |  |  | 4,733,762,000 | 4,367,987,000 |  |  |
Other assets | 139,562,000 |  |  |  | 139,562,000 | 104,119,000 |  |  |
Total assets | 4,873,324,000 |  |  |  | 4,873,324,000 | 4,472,106,000 |  |  |
Debt | 2,442,213,000 |  |  |  | 2,442,213,000 | 2,190,764,000 |  |  |
Other liabilities | 117,160,000 |  |  |  | 117,160,000 | 106,316,000 |  |  |
Equity | 2,313,951,000 |  |  |  | 2,313,951,000 | 2,175,026,000 |  |  |
Total liabilities and equity | 4,873,324,000 |  |  |  | 4,873,324,000 | 4,472,106,000 |  |  |
Company's share of equity | $ 1,335,339,000 |  |  |  | 1,335,339,000 | 1,300,140,000 |  |  |
Membership Combined Statements Of Income [Abstract] |  |  |  |  |  |  |  |  |
Property revenues |  |  |  |  | 336,922,000 | 332,164,000 | 312,841,000 |  |
Property operating expenses |  |  |  |  | (115,658,000) | (107,584,000) | (110,583,000) |  |
Net operating income |  |  |  |  | 221,264,000 | 224,580,000 | 202,258,000 |  |
Gain on sale of real estate |  |  |  |  | 112,918,000 | 24,218,000 | 90,663,000 |  |
Interest expense |  |  |  |  | (65,665,000) | (63,913,000) | (62,844,000) |  |
General and administrative |  |  |  |  | (9,575,000) | (6,379,000) | (9,091,000) |  |
Depreciation and amortization |  |  |  |  | (121,006,000) | (126,485,000) | (118,048,000) |  |
Net income |  |  |  |  | 137,936,000 | 52,021,000 | 102,938,000 |  |
Company's share of net income |  |  |  |  | $ 112,136,000 | $ 89,132,000 | $ 86,445,000 |  |
LIBOR Swap Rate | BEX IV |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  | 3.23% |
LIBOR Swap Rate | BEX IV, LLC (BEX IV), Menlo Park |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  |  | 3.25%
LIBOR Swap Rate | Wesco V, LLC (Wesco V), Emeryville |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  |  |  | 1.30% | 1.30%
LIBOR Swap Rate | Velo & Ray Apartments, Seattle, WA |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Interest rate percentage |  | 1.30% |  |  |  |  |  |  |

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- Definition Amount of gain (loss) on sale or disposal of oil and gas property or timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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