Leases - Summary of Lease Income Types Relating to Lease Payments along with Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Leased Assets [Line Items]
Residential and non-residential rent	$ 613,131	$ 660,078	$ 1,913,441	$ 1,946,999
Rental income	622,433	685,120	1,958,270	2,016,796
Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	606,834	641,268	1,876,285	1,891,423
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	6,297	18,810	37,156	55,576
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	582,234	629,473	1,819,561	1,856,365
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	576,192	611,020	1,783,298	1,801,749
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	6,042	18,453	36,263	54,616
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,440	17,225	53,047	50,940
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,306	16,987	52,538	50,290
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	134	238	509	650
Parking Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,693	9,505	29,376	28,133
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,592	9,405	29,052	27,874
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	101	100	324	259
Storage Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	921	959	2,874	2,847
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	901	940	2,814	2,796
Storage Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	20	19	60	51
Pet Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,843	2,916	8,583	8,714
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,843	2,916	8,583	8,714
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 9,302	$ 25,042	$ 44,829	$ 69,797