Organization, Basis of Presentation and Significant Accounting Policies - Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Basic and diluted shares outstanding
Weighted average common shares - basic (in shares)	139,640,421			139,386,413			139,610,205	139,338,800
Weighted average DownREIT units outstanding (in shares)	7,500			7,500			7,500	7,500
Effect of dilutive securities (in shares)	334,038			343,812			346,467	298,769
Weighted average common shares - diluted (in shares)	139,981,959			139,737,725			139,964,172	139,645,069
Calculation of Earnings per Share - basic
Net income attributable to common stockholders	$ 494,747	$ 138,691	$ 262,044	$ 78,914	$ 447,953	$ 142,223	$ 895,482	$ 669,090
Net income allocated to unvested restricted shares	(888)			(160)			(1,662)	(1,443)
Net income attributable to common stockholders, adjusted	$ 493,859			$ 78,754			$ 893,820	$ 667,647
Weighted average common shares - basic (in shares)	139,640,421			139,386,413			139,610,205	139,338,800
Earnings per common share - basic (in dollars per share)	$ 3.54			$ 0.57			$ 6.40	$ 4.79
Calculation of Earnings per Share - diluted
Net income attributable to common stockholders	$ 494,747	$ 138,691	$ 262,044	$ 78,914	$ 447,953	$ 142,223	$ 895,482	$ 669,090
Add: noncontrolling interests of DownREIT unitholders in consolidated partnerships, including discontinued operations	12			12			36	36
Adjusted net income attributable to common stockholders	$ 494,759			$ 78,926			$ 895,518	$ 669,126
Weighted average common shares - diluted (in shares)	139,981,959			139,737,725			139,964,172	139,645,069
Earnings per common share - diluted (in dollars per share)	$ 3.53			$ 0.56			$ 6.40	$ 4.79
Antidilutive securities excluded from the computation of earnings per share (in shares)							9,793