Leases - Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating Leased Assets [Line Items]
Total lease revenue	$ 596,824	$ 592,341	$ 1,745,648	$ 1,877,454
Rental income	623,206	622,433	1,818,867	1,958,270
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	580,313	590,363	1,696,070	1,845,888
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	16,511	1,978	49,578	31,566
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	565,917	582,234	1,675,458	1,819,561
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	551,474	576,192	1,629,778	1,783,298
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	14,443	6,042	45,680	36,263
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,987	17,440	55,850	53,047
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,798	17,306	55,331	52,538
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	189	134	519	509
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,616	9,693	30,868	29,376
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,513	9,592	30,403	29,052
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	103	101	465	324
Other Lease Revenue [Member]
Operating Leased Assets [Line Items]
Total lease revenue	1,304	(17,026)	(16,528)	(24,530)
Other Lease Revenue [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(472)	(12,727)	(19,442)	(19,000)
Other Lease Revenue [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	1,776	(4,299)	2,914	(5,530)
Parking Revenue
Operating Leased Assets [Line Items]
Rental income	6,883	5,336	18,455	16,648
Other Revenue
Operating Leased Assets [Line Items]
Rental income	19,499	24,756	54,764	64,168
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 26,382	$ 30,092	$ 73,219	$ 80,816