Leases - Summary of Lease Income Types Relating to Lease Payments along with Total Other Rental Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating Leased Assets [Line Items]
Residential and non-residential rent	$ 638,278	$ 646,224	$ 1,300,310	$ 1,286,921
Rental income	653,532	669,374	1,335,837	1,331,676
Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	625,857	628,247	1,269,451	1,250,155
Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	12,421	17,977	30,859	36,766
Residential and Non-Residential Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	606,753	615,902	1,237,327	1,226,892
Residential and Non-Residential Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	594,626	598,209	1,207,106	1,190,729
Residential and Non-Residential Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	12,127	17,693	30,221	36,163
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,961	17,067	35,607	33,715
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	17,814	16,858	35,232	33,303
Utility Recoveries (RUBS Income) [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	147	209	375	412
Parking Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,753	9,419	19,683	18,628
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	9,627	9,332	19,460	18,469
Parking Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	126	87	223	159
Storage Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	972	925	1,953	1,888
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	951	937	1,913	1,856
Storage Rent [Member] | Non-Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	21	(12)	40	32
Pet Rent [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,839	2,911	5,740	5,798
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Residential and non-residential rent	2,839	2,911	5,740	5,798
Other Rental Income [Member]
Operating Leased Assets [Line Items]
Rental income	$ 15,254	$ 23,150	$ 35,527	$ 44,755