Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting
Total revenue	$ 726,041	$ 690,860	$ 1,438,900	$ 1,365,569
NOI	496,432	465,673	981,739	921,702
Gross real estate	27,069,351	25,665,515	27,069,351	25,665,515
Gross real estate assets held for sale	233,212		233,212
Operating Segments | Same Store
Segment Reporting
Total revenue	672,942	652,014	1,340,130	1,291,519
NOI	467,822	454,395	931,915	901,036
Gross real estate	23,437,628	23,238,606	23,437,628	23,238,606
Operating Segments | Same Store | New England
Segment Reporting
Total revenue	91,816	87,810	182,112	173,974
NOI	63,444	59,703	124,532	117,429
Gross real estate	2,826,523	2,793,327	2,826,523	2,793,327
Operating Segments | Same Store | Metro NY/NJ
Segment Reporting
Total revenue	134,396	129,444	268,088	257,548
NOI	92,735	89,585	184,648	179,242
Gross real estate	4,365,817	4,357,275	4,365,817	4,357,275
Operating Segments | Same Store | Mid-Atlantic
Segment Reporting
Total revenue	103,458	100,866	205,297	198,977
NOI	70,888	70,559	142,100	140,257
Gross real estate	3,754,148	3,713,303	3,754,148	3,713,303
Operating Segments | Same Store | Southeast Florida
Segment Reporting
Total revenue	24,540	23,954	48,979	48,367
NOI	15,886	15,659	31,753	31,932
Gross real estate	1,099,906	1,095,712	1,099,906	1,095,712
Operating Segments | Same Store | Denver, CO
Segment Reporting
Total revenue	10,240	10,060	20,369	19,904
NOI	7,336	6,824	14,734	14,106
Gross real estate	505,650	504,407	505,650	504,407
Operating Segments | Same Store | Pacific Northwest
Segment Reporting
Total revenue	43,817	42,448	87,034	84,403
NOI	31,403	30,369	62,386	60,576
Gross real estate	1,529,151	1,517,793	1,529,151	1,517,793
Operating Segments | Same Store | Northern California
Segment Reporting
Total revenue	107,553	106,960	214,779	212,104
NOI	75,969	77,141	152,011	152,395
Gross real estate	3,808,982	3,777,500	3,808,982	3,777,500
Operating Segments | Same Store | Southern California
Segment Reporting
Total revenue	148,654	142,002	296,529	279,453
NOI	104,483	99,188	208,526	194,170
Gross real estate	5,069,842	5,004,623	5,069,842	5,004,623
Operating Segments | Same Store | Other Expansion Regions
Segment Reporting
Total revenue	8,468	8,470	16,943	16,789
NOI	5,678	5,367	11,225	10,929
Gross real estate	477,609	474,666	477,609	474,666
Operating Segments | Other Stabilized
Segment Reporting
Total revenue	27,562	17,065	52,631	31,755
NOI	19,458	11,843	36,277	21,521
Gross real estate	1,337,993	985,053	1,337,993	985,053
Operating Segments | Development / Redevelopment
Segment Reporting
Total revenue	13,748	251	21,809	255
NOI	9,152	(565)	13,547	(855)
Gross real estate	2,001,561	1,176,529	2,001,561	1,176,529
Operating Segments | Disposals
Segment Reporting
Gross real estate		447,160		447,160
Land Held for Future Development
Segment Reporting
Gross real estate	174,997	195,115	174,997	195,115
Non-allocated
Segment Reporting
Total revenue	1,830	2,712	3,625	3,778
Gross real estate	117,172	70,212	117,172	70,212
Continuing Operations
Segment Reporting
Total revenue	716,082	672,042	1,418,195	1,327,307
Continuing Operations | Operating Segments | Same Store
Segment Reporting
Total revenue	672,942	652,014	1,340,130	1,291,519
Continuing Operations | Operating Segments | Other Stabilized
Segment Reporting
Total revenue	27,562	17,065	52,631	31,755
Continuing Operations | Non-allocated
Segment Reporting
Total revenue	$ 1,830	$ 2,712	$ 3,625	$ 3,778