Organization and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Properties Community Property State shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)	Dec. 31, 2025 Property	Dec. 31, 2024 Property	Dec. 31, 2023 Property
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,480,336	115,336,876
Number of Real Estate Properties | Community	290
Development and capital improvements in progress	$ 332,035,000	$ 247,970,000
Number of States in which Entity Operates | State	16
Marketable equity securities	$ 8,000,000.0
Other non-operating income	(42,713,000)	33,902,000	$ 4,857,000
Consolidated assets	11,241,165,000	11,285,182,000
Consolidated liabilities	5,030,746,000	5,101,090,000
Advertising expenses	24,400,000	23,900,000	23,900,000
Lease Intangibles, Gross	15,182,346,000	$ 14,680,222,000
Real Estate Investments, Joint Ventures	45,200,000
Investment Income, Investment Expense	$ 10,000,000.0
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	$ 44,600,000	$ 47,000,000.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Right-of-use Lease, Liabilities	$ 28,671,000	$ 30,251,000
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accrued Liabilities	Accrued Liabilities
Operating Lease Weighted Average Remaining Lease Term	33 years
Operating Lease Weighted Average Discount Rate	4.50%
Limited Partnerships [Member]
Real Estate Properties [Line Items]
Investment Income, Investment Expense	$ 35,400,000		5,600,000
Other Assets [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	36,700,000	$ 79,400,000
Accrued Liabilities [Member]
Real Estate Properties [Line Items]
Accrued dividends payable	166,103,000	128,916,000
Accrued Real Estate Taxes	135,510,000	144,326,000
Security deposits	26,533,000	24,660,000
Interest Payable	25,132,000	26,331,000
Parent Company
Real Estate Properties [Line Items]
Capitalized Development Costs, Period	14,400,000	16,600,000	12,700,000
Real Estate [Member]
Real Estate Properties [Line Items]
Cash proceeds	43,100,000
Real Estate [Member] | Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real Estate Investments, Joint Ventures	42,300,000	42,800,000
Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets	$ 279,600,000
Consolidated liabilities		$ 15,900,000
Minimum [Member] | Land Improvements And Buildings
Real Estate Properties [Line Items]
Equipment, Useful Life	5 years
Minimum [Member] | Furniture, Fixtures And Equipment
Real Estate Properties [Line Items]
Equipment, Useful Life	3 years
Maximum [Member] | Accounting Standards Update 2016-02 [Member]
Real Estate Properties [Line Items]
Operating lease, term of contract	1 year
Maximum [Member] | Land Improvements And Buildings
Real Estate Properties [Line Items]
Equipment, Useful Life	40 years
Maximum [Member] | Furniture, Fixtures And Equipment
Real Estate Properties [Line Items]
Equipment, Useful Life	5 years
Limited Partnership [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	115,480,336	115,336,876
Number of Real Estate Properties | Property	1
Development and capital improvements in progress	$ 332,035,000	$ 247,970,000
Other non-operating income	(42,713,000)	33,902,000	$ 4,857,000
Consolidated assets	11,241,165,000	11,285,182,000
Consolidated liabilities	5,030,765,000	5,101,109,000
Lease Intangibles, Gross	15,182,346,000	14,680,222,000
Investment Income, Investment Expense		51,700
Limited Partnership [Member] | Real Estate [Member] | Variable Interest Entity Primary Beneficiary [Member]
Real Estate Properties [Line Items]
Consolidated assets		$ 252,800,000
Consolidated liabilities	$ 14,500,000
Limited Partnership [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	80.00%
Limited Partnership [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Percentage of ownership interests of all consolidated subsidiaries (percent)	100.00%
Development Properties [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Community	6
Number of units under development community | Properties	2,310
Development Properties [Member] | Expected Costs
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 728,700,000
Development Properties [Member] | Costs Incurred To Date | Limited Partnership [Member]
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 291,700,000
Development Properties [Member] | Scenario Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property				2	2	2
Retail
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property	34
M A A L P
Real Estate Properties [Line Items]
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest	97.30%	97.30%