Organization, Basis of Presentation, and Significant Accounting Policies - Earnings per Common Share (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) community $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares) | shares	139,634,294	139,389,433	140,094,722
Weighted average DownREIT units outstanding (in shares) | shares	7,500	7,500	7,500
Effect of dilutive securities (in shares) | shares	333,293	320,466	332,973
Weighted average common shares - diluted (in shares) | shares	139,975,087	139,717,399	140,435,195
Calculation of Earnings per Share—basic
Net income attributable to common stockholders	$ 1,136,775,000	$ 1,004,299,000	$ 827,630,000
Net income allocated to unvested restricted shares	(2,091,000)	(2,100,000)	(1,955,000)
Net income attributable to common stockholders—basic	$ 1,134,684,000	$ 1,002,199,000	$ 825,675,000
Weighted average common shares - basic (in shares) | shares	139,634,294	139,389,433	140,094,722
Earnings per common share - basic (in dollars per share) | $ / shares	$ 8.13	$ 7.19	$ 5.89
Calculation of Earnings per Share—diluted
Net income attributable to common stockholders	$ 1,136,775,000	$ 1,004,299,000	$ 827,630,000
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations	48,000	48,000	48,000
Net income attributable to common stockholders—diluted	$ 1,136,823,000	$ 1,004,347,000	$ 827,678,000
Weighted average common shares - diluted (in shares) | shares	139,975,087	139,717,399	140,435,195
Earnings per common share - diluted (in dollars per share) | $ / shares	$ 8.12	$ 7.19	$ 5.89
Antidilutive securities excluded from computation of earnings per share | shares	291,881
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets
Abandoned pursuits costs	$ 16,565,000	$ 2,192,000	$ 12,317,000
Impairment of long-lived assets held-for-use	0	0	0
Casualty loss	0	3,119,000	0
Impairment of investment in unconsolidated entities	$ 0	0	0
Number of communities held for sale | community	0
Uncollectible lease revenue	$ 49,147,000	52,075,000	66,763,000
Pacific Northwest and Southern California
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets
Abandoned pursuits costs	$ 10,073,000
New York City, NY
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets
Abandoned pursuits costs			$ 7,264,000
East Coast | Hurricane and Fire
Casualty Loss, Abandoned Pursuit Costs and Impairment of Long-Lived Assets
Casualty loss		$ 3,119,000