Leases - Summary of Lease Income Types Relating to Lease Payments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Leased Assets [Line Items]
Total lease revenue	$ 662,032	$ 640,697
Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	643,594	621,908
Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,438	18,789
Residential and Retail Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	630,574	610,990
Residential and Retail Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	612,480	592,520
Residential and Retail Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	18,094	18,470
Utility Recoveries (RUBS Income) [Member]
Operating Leased Assets [Line Items]
Total lease revenue	17,646	16,648
Utility Recoveries (RUBS Income) [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	17,418	16,445
Utility Recoveries (RUBS Income) [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	228	203
Parking Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	9,930	9,209
Parking Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	9,833	9,137
Parking Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	97	72
Storage Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	981	963
Storage Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	962	919
Storage Rent [Member] | Retail Lease [Member]
Operating Leased Assets [Line Items]
Total lease revenue	19	44
Pet Rent [Member]
Operating Leased Assets [Line Items]
Total lease revenue	2,901	2,887
Pet Rent [Member] | Residential Leases [Member]
Operating Leased Assets [Line Items]
Total lease revenue	$ 2,901	$ 2,887