Real Estate Investments - Co-Investments (Details) $ in Thousands	1 Months Ended				12 Months Ended
	Nov. 30, 2021 USD ($) apartment	Oct. 31, 2021 USD ($) apartment	Sep. 30, 2021 USD ($) apartment	Jun. 30, 2021	Dec. 31, 2021 USD ($) apartment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					$ 1,142,257	$ 1,018,010
Membership Combined Balance Sheets [Abstract]
Rental properties and real estate under development					111,562	386,047
Total assets					12,997,873	12,936,177
Debt					6,786,699	6,720,746
Other liabilities					39,969	39,140
Equity					6,176,508	6,183,192	$ 6,403,504	$ 6,393,844
Total liabilities and equity/capital					12,997,873	12,936,177
Membership Combined Statements Of Income [Abstract]
Total revenues					1,440,556	1,495,748	1,460,155
Interest expense					(203,125)	(220,633)	(217,339)
General and administrative					(51,838)	(65,388)	(54,262)
Equity income from co-investments					111,721	66,512	112,136
Net income					$ 515,691	599,332	464,448
Vista, CA
Business Acquisition [Line Items]
Purchase price	$ 44,000
Silver Apartments
Business Acquisition [Line Items]
Ownership percentage	58.00%
Number of units acquired | apartment	268
Transfer from co-investments to rental properties	$ 11,000
Commitment to fund preferred equity investment in the project	$ 13,500
Annualized preferred return rate	8.00%
Apartment Building
Business Acquisition [Line Items]
Number of units acquired | apartment					268
Purchase price					$ 165,400
Apartment Building | Vista, CA
Business Acquisition [Line Items]
Number of units acquired | apartment	179
Total Co-Investment
Membership Combined Balance Sheets [Abstract]
Rental properties and real estate under development					4,603,465	4,242,611
Other assets					278,411	200,777
Total assets					4,881,876	4,443,388
Debt					3,046,765	2,611,365
Other liabilities					200,129	189,515
Equity					1,634,982	1,642,508
Total liabilities and equity/capital					4,881,876	4,443,388
Company's share of equity					1,142,257	1,018,010
Membership Combined Statements Of Income [Abstract]
Total revenues					289,680	300,624	336,922
Property operating expenses					(115,023)	(108,682)	(115,658)
Net operating income					174,657	191,942	221,264
Gain on sale of real estate					0	0	112,918
Interest expense					(65,172)	(78,962)	(65,665)
General and administrative					(17,885)	(17,079)	(9,575)
Depreciation and amortization					(133,787)	(117,836)	(121,006)
Net income					(42,187)	(21,935)	137,936
Company's share of net income					111,721	66,512	112,136
Investments with Related Parties
Membership Combined Statements Of Income [Abstract]
Equity income from co-investments					$ 9,100	8,600	$ 7,500
Affiliated Entity | Martha Lake Apartment | Related Party Bridge Loans on Property Acquired by Wesco VI
Business Acquisition [Line Items]
Notes receivable, related parties			$ 29,200
Interest rate			2.15%
Affiliated Entity | Monterra In Mill Creek | Related Party Bridge Loans on Property Acquired by Wesco VI
Business Acquisition [Line Items]
Notes receivable, related parties		$ 30,300
Interest rate		2.30%
Affiliated Entity | Vista, CA | Related Party Bridge Loans on Property Acquired by Monarch Buena Vista Borrower LLC
Business Acquisition [Line Items]
Notes receivable, related parties	$ 48,400
Interest rate	2.36%
Affiliated Entity | The Rexford | Related Party Bridge Loans on Property Acquired by Wesco VI
Business Acquisition [Line Items]
Notes receivable, related parties	$ 61,900
Interest rate	2.36%
Affiliated Entity | Silver Apartments | Related Party Bridge Loans on Property Acquired by Wesco VI
Business Acquisition [Line Items]
Notes receivable, related parties	$ 100,000
Interest rate	3.15%
Wesco VI, LLC | Martha Lake Apartment
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			$ 150,000
Purchase price			$ 53,000
Wesco VI, LLC | Monterra In Mill Creek
Business Acquisition [Line Items]
Purchase price		$ 55,000
Wesco VI, LLC | The Rexford
Business Acquisition [Line Items]
Purchase price	$ 112,500
Wesco VI, LLC | Apartment Building | Martha Lake Apartment
Business Acquisition [Line Items]
Number of units acquired | apartment			155
Wesco VI, LLC | Apartment Building | Monterra In Mill Creek
Business Acquisition [Line Items]
Number of units acquired | apartment		139
Wesco VI, LLC | Apartment Building | The Rexford
Business Acquisition [Line Items]
Number of units acquired | apartment	203
Wesco I, III, IV, V, and VI
Business Acquisition [Line Items]
Ownership percentage					52.00%
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					$ 168,198	178,322
BEXAEW, BEX II, BEX III, BEX IV, and 500 Folsom
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					$ 270,550	152,309
Other
Business Acquisition [Line Items]
Ownership percentage					52.00%
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					$ 126,503	27,635
Total operating and other co-investments, net
Business Acquisition [Line Items]
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					$ 565,251	358,266
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					$ 11,076	157,433
Total preferred interest co-investments
Business Acquisition [Line Items]
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					565,930	502,311
Total preferred interest co-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					71,100	$ 81,400
Wesco I
Business Acquisition [Line Items]
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					35,300
Joint Venture Partner, BEX III | The Village at Toluca Lake
Business Acquisition [Line Items]
Investment interest acquired				50.00%
Expo
Business Acquisition [Line Items]
Investments in (distributions in excess of investments in) and advance to affiliates, subsidiaries, associates and joint ventures					$ 200