Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Property ApartmentUnit $ / shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Lease intangibles, average term	6 months
Capitalized costs development and renovation	$ 13,900,000	$ 12,100,000
Lessee, finance lease, description	The Company is a lessor for its residential and non-residential leases and is a lessee for its corporate headquarters and regional offices and ground leases for land underlying current operating properties or projects under development.  If applicable, lease agreements must be evaluated to determine the accounting treatment as a finance or operating lease in accordance with the lease standard.  A lease is classified as a finance lease if it meets any of the following criteria:  (a) Ownership of the underlying asset is transferred to the lessee by the end of the lease term; (b) the lessee has and is reasonably certain to exercise an option to purchase the underlying asset; (c) the lease term is for the major part of the remaining economic life of the underlying asset; (d) the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset; and (e) the underlying asset is expected to have no alternative use to the lessor at the end of the lease term due to its specialized nature.
Lessee, finance lease residual value guarantee, description	the present value of future minimum lease payments is equal to substantially all of the fair value of the underlying asset
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01	$ 0.01
Provision for income tax	$ 915,000	$ 852,000	$ (2,281,000)
Remaining AMT refund received		1,600,000
Land and depreciable property net	$ 13,200,000,000	13,800,000,000
Alternative minimum tax preference adjustment per share | $ / shares	$ 0.06
Alternative minimum tax preference adjustment disclosed under treasury regulation year one per share | $ / shares	0.02650
Alternative minimum tax preference adjustment disclosed under treasury regulation year three per share | $ / shares	$ 0.00584
Properties | Property	310
Noncontrolling Interests – Partially Owned Properties	$ 18,166,000	$ 4,673,000
Apartment units | ApartmentUnit	80,407
Partially Owned Properties – Consolidated
Properties | Property	16
Noncontrolling Interests – Partially Owned Properties	$ 18,200,000
Apartment units | ApartmentUnit	3,546
Limited Life Partnership Properties [Member]
Properties | Property	2
Noncontrolling Interests – Partially Owned Properties	$ (4,800,000)
Noncontrolling interests settlement value	70,800,000
Federal [Member]
Provision for income tax	$ 0
Minimum [Member] | Retail Commercial Leases [Member]
Retail leases term	5 years
Maximum [Member] | Retail Commercial Leases [Member]
Retail leases term	10 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	10 years
Building [Member]
Property, plant and equipment, estimated useful lives	30 years
Replacements [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Replacements [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	10 years
Renovations and Improvements Minimum [Member] | Minimum [Member]
Property, plant and equipment, estimated useful lives	5 years
Renovations and Improvements Minimum [Member] | Maximum [Member]
Property, plant and equipment, estimated useful lives	15 years
Corporate Office Leases [Member] | Maximum [Member]
Remaining lease terms	10 years
Ground Leases [Member]
Unsecured borrowing rates for actual pricing period used for calculating discount rate	30 years