Segment Reporting - Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting
Total revenue	$ 665,288	$ 580,774	$ 1,923,775	$ 1,693,653
NOI	449,152	371,913	1,300,071	1,075,955
Gross real estate	25,564,352	23,820,368	25,564,352	23,820,368
Gross real estate assets held for sale	78,662		78,662
Operating Segments | Same Store
Segment Reporting
Total revenue	574,782	513,781	1,671,920	1,502,753
NOI	394,039	344,055	1,155,653	1,012,526
Gross real estate	20,174,516	19,969,854	20,174,516	19,969,854
Operating Segments | Same Store | New England
Segment Reporting
Total revenue	89,107	77,754	254,661	226,516
NOI	59,271	48,696	168,041	144,116
Gross real estate	2,874,594	2,840,108	2,874,594	2,840,108
Operating Segments | Same Store | Metro NY/NJ
Segment Reporting
Total revenue	120,111	104,940	344,785	308,252
NOI	81,824	70,459	237,804	209,265
Gross real estate	4,108,778	4,079,405	4,108,778	4,079,405
Operating Segments | Same Store | Mid-Atlantic
Segment Reporting
Total revenue	85,255	78,284	247,977	231,341
NOI	56,583	51,391	167,338	154,252
Gross real estate	3,196,309	3,167,632	3,196,309	3,167,632
Operating Segments | Same Store | Southeast Florida
Segment Reporting
Total revenue	9,661	8,152	28,171	23,099
NOI	6,374	5,026	18,522	13,772
Gross real estate	398,306	395,594	398,306	395,594
Operating Segments | Same Store | Denver, CO
Segment Reporting
Total revenue	6,891	6,070	19,869	17,576
NOI	4,905	4,011	14,531	11,965
Gross real estate	321,354	320,214	321,354	320,214
Operating Segments | Same Store | Pacific Northwest
Segment Reporting
Total revenue	37,379	32,344	107,987	93,911
NOI	26,273	22,079	76,596	63,493
Gross real estate	1,295,468	1,286,674	1,295,468	1,286,674
Operating Segments | Same Store | Northern California
Segment Reporting
Total revenue	102,955	92,636	300,171	277,571
NOI	73,498	64,562	214,269	195,136
Gross real estate	3,674,996	3,629,269	3,674,996	3,629,269
Operating Segments | Same Store | Southern California
Segment Reporting
Total revenue	123,423	113,601	368,299	324,487
NOI	85,311	77,831	258,552	220,527
Gross real estate	4,304,711	4,250,958	4,304,711	4,250,958
Operating Segments | Other Stabilized
Segment Reporting
Total revenue	56,888	32,601	151,198	80,447
NOI	38,364	20,612	101,175	47,909
Gross real estate	2,890,645	2,092,971	2,890,645	2,092,971
Operating Segments | Development / Redevelopment
Segment Reporting
Total revenue	24,904	12,061	63,493	28,084
NOI	16,749	7,246	43,243	15,520
Gross real estate	2,177,648	1,411,995	2,177,648	1,411,995
Operating Segments | Disposals
Segment Reporting
Gross real estate		555,942		555,942
Land Held for Future Development
Segment Reporting
Gross real estate	167,277	66,769	167,277	66,769
Non-allocated
Segment Reporting
Total revenue	1,399	695	3,054	2,380
Gross real estate	154,266	278,779	154,266	278,779
Continuing Operations
Segment Reporting
Total revenue	657,973	559,138	1,889,665	1,613,664
Continuing Operations | Operating Segments | Same Store
Segment Reporting
Total revenue	574,782	513,781	1,671,920	1,502,753
Continuing Operations | Operating Segments | Other Stabilized
Segment Reporting
Total revenue	56,888	32,601	151,198	80,447
Continuing Operations | Non-allocated
Segment Reporting
Total revenue	$ 1,399	$ 695	$ 3,054	$ 2,380