Organization, Basis of Presentation, and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares)	141,307,186	139,634,294	139,389,433
Weighted average DownREIT units outstanding (in shares)	3,503	7,500	7,500
Effect of dilutive securities (in shares)	333,099	333,293	320,466
Weighted average common shares - diluted (in shares)	141,643,788	139,975,087	139,717,399
Calculation of Earnings per Common Share—basic
Net income attributable to common stockholders	$ 928,825	$ 1,136,775	$ 1,004,299
Net income allocated to unvested restricted shares	(1,663)	(2,091)	(2,100)
Net income attributable to common stockholders—basic	$ 927,162	$ 1,134,684	$ 1,002,199
Weighted average common shares - basic (in shares)	141,307,186	139,634,294	139,389,433
Earnings per common share - basic (in dollars per share)	$ 6.56	$ 8.13	$ 7.19
Calculation of Earnings per Common Share—diluted
Net income attributable to common stockholders	$ 928,825	$ 1,136,775	$ 1,004,299
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations	25	48	48
Net income attributable to common stockholders—diluted	$ 928,850	$ 1,136,823	$ 1,004,347
Weighted average common shares - diluted (in shares)	141,643,788	139,975,087	139,717,399
Earnings per common share - diluted (in dollars per share)	$ 6.56	$ 8.12	$ 7.19
Antidilutive securities excluded from computation of earnings per share	303,784	291,881