Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting
Total revenue	$ 690,860	$ 644,559	$ 1,365,569	$ 1,258,486
NOI	471,020	435,685	932,381	842,406
Gross real estate	26,173,584	24,698,038	26,173,584	24,698,038
Gross real estate assets held for sale	106,098		106,098
Operating Segments | Same Store
Segment Reporting
Total revenue	636,890	599,828	1,261,641	1,170,919
NOI	440,703	418,464	873,479	810,400
Gross real estate	22,351,926	22,131,553	22,351,926	22,131,553
Operating Segments | Same Store | New England
Segment Reporting
Total revenue	91,269	84,243	180,732	164,414
NOI	61,570	56,444	120,976	108,137
Gross real estate	2,906,134	2,873,720	2,906,134	2,873,720
Operating Segments | Same Store | Metro NY/NJ
Segment Reporting
Total revenue	133,790	123,855	266,285	242,497
NOI	91,850	85,874	183,903	167,369
Gross real estate	4,477,824	4,443,758	4,477,824	4,443,758
Operating Segments | Same Store | Mid-Atlantic
Segment Reporting
Total revenue	92,494	86,609	182,367	169,988
NOI	63,849	59,453	127,015	116,712
Gross real estate	3,417,578	3,378,869	3,417,578	3,378,869
Operating Segments | Same Store | Southeast Florida
Segment Reporting
Total revenue	18,809	17,034	38,119	33,493
NOI	12,342	10,799	25,274	21,281
Gross real estate	800,150	794,486	800,150	794,486
Operating Segments | Same Store | Denver, CO
Segment Reporting
Total revenue	7,036	6,663	13,882	12,978
NOI	4,821	4,900	9,765	9,627
Gross real estate	321,900	321,043	321,900	321,043
Operating Segments | Same Store | Pacific Northwest
Segment Reporting
Total revenue	43,128	41,189	85,789	80,040
NOI	30,601	29,594	61,030	57,071
Gross real estate	1,538,635	1,528,734	1,538,635	1,528,734
Operating Segments | Same Store | Northern California
Segment Reporting
Total revenue	106,960	100,888	212,104	197,993
NOI	76,678	72,166	151,466	140,919
Gross real estate	3,777,499	3,738,969	3,777,499	3,738,969
Operating Segments | Same Store | Southern California
Segment Reporting
Total revenue	137,441	133,920	270,540	258,890
NOI	94,965	95,471	185,947	181,918
Gross real estate	4,784,990	4,729,905	4,784,990	4,729,905
Operating Segments | Same Store | Other Expansion Regions
Segment Reporting
Total revenue	5,963	5,427	11,823	10,626
NOI	4,027	3,763	8,103	7,366
Gross real estate	327,216	322,069	327,216	322,069
Operating Segments | Other Stabilized
Segment Reporting
Total revenue	32,240	19,078	63,972	34,291
NOI	22,319	13,326	44,667	24,063
Gross real estate	1,522,042	1,129,359	1,522,042	1,129,359
Operating Segments | Development / Redevelopment
Segment Reporting
Total revenue	13,029	6,546	23,529	12,597
NOI	7,998	3,895	14,235	7,943
Gross real estate	1,973,380	1,125,990	1,973,380	1,125,990
Operating Segments | Disposals
Segment Reporting
Gross real estate		462,673		462,673
Land Held for Future Development
Segment Reporting
Gross real estate	195,115	194,458	195,115	194,458
Non-allocated
Segment Reporting
Total revenue	2,712	904	3,778	1,656
Gross real estate	131,121	116,678	131,121	116,678
Continuing Operations
Segment Reporting
Total revenue	684,871	626,356	1,352,920	1,219,463
Continuing Operations | Operating Segments | Same Store
Segment Reporting
Total revenue	636,890	599,828	1,261,641	1,170,919
Continuing Operations | Operating Segments | Other Stabilized
Segment Reporting
Total revenue	32,240	19,078	63,972	34,291
Continuing Operations | Non-allocated
Segment Reporting
Total revenue	$ 2,712	$ 904	$ 3,778	$ 1,656