Debt - Summary of Consolidated Indebtedness (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,831,231		$ 1,831,231	$ 1,819,738
Interest Rate Caps
Debt Instrument [Line Items]
Long-term debt, gross	$ 107,300		107,300	110,500
SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	2.61%	2.56%
Total Debt - Variable Rate Debt Fixed with Interest Rate Swap Agreements
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,164,100		1,164,100	860,400
Core Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	204,716		204,716	218,421
Fund Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	427,418		$ 427,418	388,410
Minimum | Core Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Minimum | Core Portfolio | Unsecured Notes Payable | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.55%
Minimum | Core Portfolio | Unsecured Line of Credit [Member] | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.40%
Maximum | Core Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.70%
Fund II | Variable Rate Debt | SOFR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate			2.61%
Fund II | Fund Portfolio
Debt Instrument [Line Items]
Long-term debt, gross	132,259		$ 132,259	$ 255,978
Fund II | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				2.75%
Fund II | Fund Portfolio | Variable Rate Debt | PRIME | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Fund II | Fund Portfolio | Variable Rate Debt | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate			2.61%
Fund III | Fund Portfolio
Debt Instrument [Line Items]
Long-term debt, gross	35,970		$ 35,970	$ 34,728
Fund III | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			3.10%
Fund III | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				2.75%
Fund IV | Fund Portfolio | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	152,855		$ 152,855	$ 246,268
Fund IV | Fund Portfolio | Variable Rate Debt | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	151,735		$ 151,735	$ 221,832
Fund IV | Minimum | Fund Portfolio | Variable Rate Debt | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Fund IV | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Fund IV | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				1.60%
Fund IV | Maximum | Fund Portfolio | Variable Rate Debt | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate			3.65%
Fund IV | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			3.65%
Fund IV | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				3.65%
Fund V | Fund Portfolio | Variable Rate Debt | Mortgages
Debt Instrument [Line Items]
Long-term debt, gross	$ 58,136		$ 58,136	$ 58,878
Fund V | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate			1.85%
Fund V | Fund Portfolio | Variable Rate Debt | SOFR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate			2.76%
Fund V | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Fund V | Minimum | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				1.85%
Fund V | Maximum | Fund Portfolio | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			1.60%
Fund V | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate			2.50%
Fund V | Maximum | Fund Portfolio | Variable Rate Debt | LIBOR | Mortgages
Debt Instrument [Line Items]
Basis spread on variable rate				2.76%