Organization and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) Properties Community Property State shares	Jun. 30, 2023 USD ($) shares	Jun. 30, 2024 USD ($) Properties Community Property State shares	Jun. 30, 2023 USD ($) shares	Dec. 31, 2026 Property	Dec. 31, 2025 Property	Dec. 31, 2024 Property	Dec. 31, 2023 USD ($) shares
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	116,858,044	116,676,966	116,858,044	116,676,966
Number of Real Estate Properties | Community	291		291
Number of units under development community | Properties	2,617		2,617
Development and capital improvements in progress	$ 391,366		$ 391,366					$ 385,405
Number of States in which Entity Operates | State	16		16
Consolidated assets	$ 11,562,867		$ 11,562,867					11,484,503
Consolidated liabilities	5,356,848		5,356,848					5,185,381
Real Estate Investments, Joint Ventures	$ 32,400		$ 32,400
Percentage Of Rental Revenue From Leasing Of Apartment Homes			94.00%
Percentage Of Reimbursable Revenue From Leasing Of Apartment Homes			5.00%
Percentage of Rental Revenue and Other Income From Non-leasing Activities			1.00%
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets		Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other liabilities		Accrued expenses and other liabilities
Operating Lease, Right-of-Use Asset	$ 41,300		$ 41,300					42,500
Right-of-use Lease, Liability	26,512		26,512					27,300
Marketable equity securities received	0	$ 7,700	0	$ 7,700
Net proceeds from sale of marketable equity securities	6,700		6,729	0
Net realized / unrealized gain on sale	5,600
Marketable equity securities	7,700		7,700					18,600
Marketable Equity Securities [Member]
Real Estate Properties [Line Items]
Investment Income		7,500		6,600
Investment Expense	1,200		4,200
Limited Partnership [Member]
Real Estate Properties [Line Items]
Investment Income	300	$ 800	8,500	$ 700
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	55,800		55,800					46,500
Real Estate [Member] | Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	$ 41,800		$ 41,800					$ 42,000
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year		1 year
Development Properties [Member] | Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property					2	2	3
Retail [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property	35		35
M A A L P [Member]
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest			97.40%	97.40%
Limited Partnership [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	116,858,044		116,858,044					116,694,124
Number of Real Estate Properties | Property	1		1
Development and capital improvements in progress	$ 391,366		$ 391,366					$ 385,405
Consolidated assets	11,562,867		11,562,867					11,484,503
Consolidated liabilities	5,356,867		5,356,867					5,185,400
Net proceeds from sale of marketable equity securities			6,729	$ 0
Limited Partnership [Member] | Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	332,700		332,700					265,100
Consolidated liabilities	$ 13,900		$ 13,900					$ 12,900
Limited Partnership [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%		80.00%
Limited Partnership [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%		100.00%
Limited Partnership [Member] | Development Properties [Member] | Costs Incurred To Date [Member]
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 537,900		$ 537,900