Organization and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Properties Community Property State shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2025 Property	Dec. 31, 2024 Property
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	116,694,124	115,480,336
Number of Real Estate Properties | Community	290
Number of States in which Entity Operates | State	16
Real estate investments joint ventures	$ 33,600,000
Development and capital improvements in progress	385,405,000	$ 332,035,000
Consolidated assets	11,484,503,000	11,241,165,000
Consolidated liabilities	5,185,381,000	5,030,746,000
Real Estate Investment Property, at Cost	15,932,757,000	15,182,346,000
Investment Income	2,900,000	10,000,000
Marketable equity securities received	7,700,000	18,000,000
Marketable equity securities	$ 18,600,000	8,000,000
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%
Advertising expenses	$ 26,600,000	$ 24,400,000	$ 23,900,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets	Other assets
Operating Lease, Right-of-Use Asset	$ 42,500,000	$ 44,600,000
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Right-of-use lease, liabilities	$ 27,344,000	$ 28,671,000
Leases, Acquired-in-Place
Real Estate Properties [Line Items]
Real Estate Investment Property, at Cost	1,600,000	800
Limited Partnerships [Member]
Real Estate Properties [Line Items]
Investment Income	1,600,000	35,400,000	51,700,000
Real Estate [Member]
Real Estate Properties [Line Items]
Proceeds from (Payments to) Noncontrolling Interests, Total	15,800,000	43,100,000
Real Estate [Member] | Post Massachusetts Avenue [Member]
Real Estate Properties [Line Items]
Real estate investments joint ventures	42,000,000	42,300,000
Other Assets [Member]
Real Estate Properties [Line Items]
Real estate investments joint ventures	46,500,000	36,700,000
Parent Company [Member]
Real Estate Properties [Line Items]
Capitalized Development Costs, Period	$ 20,600,000	$ 14,400,000	$ 16,600,000
Minimum [Member] | Land Improvements And Buildings
Real Estate Properties [Line Items]
Equipment, Useful Life	5 years
Minimum [Member] | Furniture and Fixtures
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 and Fixtures
Real Estate Properties [Line Items]
Equipment, Useful Life	5 years
Development Properties [Member]
Real Estate Properties [Line Items]
Number of units under development community | Properties	1,970
Development Properties [Member] | Forecast [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property				2	3
Retail [Member]
Real Estate Properties [Line Items]
Number of Real Estate Properties | Property				34
Limited Partnership [Member]
Real Estate Properties [Line Items]
General Partners' Capital Account, Units Outstanding | shares	116,694,124	115,480,336
Number of Real Estate Properties | Property	1
Development and capital improvements in progress	$ 385,405,000	$ 332,035,000
Consolidated assets	11,484,503,000	11,241,165,000
Consolidated liabilities	5,185,400,000	5,030,765,000
Real Estate Investment Property, at Cost	15,932,757,000	15,182,346,000
Limited Partnership [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Real Estate [Member]
Real Estate Properties [Line Items]
Consolidated assets	265,100,000	279,600,000
Consolidated liabilities	$ 12,900,000	$ 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%
Limited Partnership [Member] | Development Properties [Member] | Costs Incurred To Date [Member]
Real Estate Properties [Line Items]
Development and capital improvements in progress	$ 391,600,000
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%	97.30%