Summary of Significant Accounting Policies - Schedule of Rental Income Detail by Leasing and Revenue Recognition Standards Along with Percentages of Rental Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leasing standard	$ 2,608,103
Percentage of rental income	100.00%	100.00%
Rental income	$ 2,700,691	$ 2,577,681	$ 2,470,689
Percentage of rental income	100.00%	100.00%
Residential and Retail Rent [Member]
Leasing standard	$ 2,486,189
Utility Recoveries ("RUBS") [Member]
Leasing standard	68,576
Storage Rent [Member]
Leasing standard	3,816
Pet Rent [Member]
Leasing standard	11,617
Accounting Standards Update 2016-02 [Member]
Leasing standard	$ 2,608,103	$ 2,481,386
Percentage of rental income	96.60%	96.30%
Percentage of rental income	96.60%	96.30%
Accounting Standards Update 2016-02 [Member] | Residential and Retail Rent [Member]
Leasing standard	$ 2,486,189	$ 2,369,552
Accounting Standards Update 2016-02 [Member] | Utility Recoveries ("RUBS") [Member]
Leasing standard	68,576	63,218
Accounting Standards Update 2016-02 [Member] | Parking Rent [Member]
Leasing standard	37,905	33,757
Accounting Standards Update 2016-02 [Member] | Storage Rent [Member]
Leasing standard	3,816	3,674
Accounting Standards Update 2016-02 [Member] | Pet Rent [Member]
Leasing standard	$ 11,617	$ 11,185
Accounting Standards Update 2014-09 [Member]
Percentage of rental income	3.40%	3.70%
Rental income	$ 92,588	$ 96,295
Percentage of rental income	3.40%	3.70%
Accounting Standards Update 2014-09 [Member] | Parking Revenue [Member]
Rental income	$ 28,272	$ 26,743
Accounting Standards Update 2014-09 [Member] | Other Revenue [Member]
Rental income	$ 64,316	$ 69,552