Leases - Summary of Lease Income Types Relating to Lease Payments Along With the Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating Leased Assets [Line Items]
Total lease revenue	$ 574,850	$ 627,456	$ 1,148,824	$ 1,285,113
Rental income	598,059	653,532	1,195,661	1,335,837
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	558,676	616,007	1,115,757	1,255,525
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	16,174	11,449	33,067	29,588
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	554,047	606,753	1,109,541	1,237,327
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	538,649	594,626	1,078,304	1,207,106
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	15,398	12,127	31,237	30,221
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,731	17,961	36,863	35,607
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,579	17,814	36,533	35,232
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	152	147	330	375
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,251	9,753	20,252	19,683
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	10,156	9,627	19,890	19,460
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	95	126	362	223
Other Lease Revenue [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(8,179)	(7,011)	(17,832)	(7,504)
Other Lease Revenue [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	(8,708)	(6,060)	(18,970)	(6,273)
Other Lease Revenue [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	529	(951)	1,138	(1,231)
Parking Revenue
Operating Leased Assets [Line Items]
Rental income	6,139	4,529	11,572	11,312
Other Revenue
Operating Leased Assets [Line Items]
Rental income	17,070	21,547	35,265	39,412
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 23,209	$ 26,076	$ 46,837	$ 50,724