Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting
Total revenue	$ 734,307	$ 697,635	$ 2,173,208	$ 2,063,204
NOI	496,960	467,062	1,475,805	1,386,052
Gross real estate	27,522,745	25,954,522	27,522,745	25,954,522
Gross real estate assets held for sale	68,263		68,263
Operating Segments | Same Store
Segment Reporting
Total revenue	677,579	657,573	2,013,371	1,944,989
NOI	461,762	452,784	1,390,784	1,351,108
Gross real estate	23,441,298	23,226,369	23,441,298	23,226,369
Operating Segments | Same Store | New England
Segment Reporting
Total revenue	91,982	88,256	271,263	259,673
NOI	61,758	58,585	184,215	174,156
Gross real estate	2,798,805	2,768,023	2,798,805	2,768,023
Operating Segments | Same Store | Metro NY/NJ
Segment Reporting
Total revenue	135,374	131,701	403,462	389,250
NOI	90,689	89,294	275,337	268,536
Gross real estate	4,382,578	4,365,736	4,382,578	4,365,736
Operating Segments | Same Store | Mid-Atlantic
Segment Reporting
Total revenue	105,465	101,888	310,762	300,865
NOI	70,905	70,578	213,005	210,835
Gross real estate	3,767,527	3,725,935	3,767,527	3,725,935
Operating Segments | Same Store | Southeast Florida
Segment Reporting
Total revenue	24,292	23,831	73,271	72,198
NOI	15,150	15,426	46,902	47,358
Gross real estate	1,101,440	1,097,837	1,101,440	1,097,837
Operating Segments | Same Store | Denver, CO
Segment Reporting
Total revenue	10,369	10,272	30,738	30,176
NOI	7,315	7,231	22,049	21,337
Gross real estate	505,910	504,590	505,910	504,590
Operating Segments | Same Store | Pacific Northwest
Segment Reporting
Total revenue	44,155	42,308	131,188	126,710
NOI	31,315	29,800	93,702	90,376
Gross real estate	1,532,051	1,521,311	1,532,051	1,521,311
Operating Segments | Same Store | Northern California
Segment Reporting
Total revenue	107,860	105,974	321,132	316,533
NOI	76,293	75,927	227,486	227,469
Gross real estate	3,788,817	3,748,596	3,788,817	3,748,596
Operating Segments | Same Store | Southern California
Segment Reporting
Total revenue	149,491	144,695	446,020	424,147
NOI	103,050	100,468	311,576	294,637
Gross real estate	5,085,618	5,019,118	5,085,618	5,019,118
Operating Segments | Same Store | Other Expansion Regions
Segment Reporting
Total revenue	8,591	8,648	25,535	25,437
NOI	5,287	5,475	16,512	16,404
Gross real estate	478,552	475,223	478,552	475,223
Operating Segments | Other Stabilized
Segment Reporting
Total revenue	31,646	20,753	84,278	52,507
NOI	21,171	14,288	57,447	35,809
Gross real estate	1,557,340	1,077,588	1,557,340	1,077,588
Operating Segments | Development / Redevelopment
Segment Reporting
Total revenue	20,108	1,588	41,917	1,842
NOI	14,027	(10)	27,574	(865)
Gross real estate	2,249,625	1,397,887	2,249,625	1,397,887
Operating Segments | Disposals
Segment Reporting
Gross real estate		451,795		451,795
Land Held for Future Development
Segment Reporting
Gross real estate	154,906	183,158	154,906	183,158
Non-allocated
Segment Reporting
Total revenue	1,716	1,934	5,342	5,712
Gross real estate	119,576	69,520	119,576	69,520
Continuing Operations
Segment Reporting
Total revenue	731,049	681,848	2,144,908	2,005,050
Continuing Operations | Operating Segments | Same Store
Segment Reporting
Total revenue	677,579	657,573	2,013,371	1,944,989
Continuing Operations | Operating Segments | Other Stabilized
Segment Reporting
Total revenue	31,646	20,753	84,278	52,507
Continuing Operations | Non-allocated
Segment Reporting
Total revenue	$ 1,716	$ 1,934	$ 5,342	$ 5,712