Debt - Summary of Consolidated Indebtedness (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, gross	[1],[2]	$ 1,758,133			$ 1,805,414
Net unamortized debt issuance costs		(11,844)			(12,697)
Unamortized premium		317			343
Secured Debt, Total		926,918			928,639
Unsecured notes payable, net		647,101			696,134
Total Indebtedness		1,746,606			1,793,060
Fund IV
Debt Instrument [Line Items]
Long-term debt, gross		39,200			$ 39,200
Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate					1.00%
SOFR
Debt Instrument [Line Items]
Basis spread on variable rate			2.61%	2.56%
Fund Portfolio | Fund III
Debt Instrument [Line Items]
Long-term debt, gross					$ 35,970
Mortgages
Debt Instrument [Line Items]
Net unamortized debt issuance costs		(7,121)			(7,621)
Unamortized premium		317			343
Secured Debt, Total		926,918			928,639
Mortgages | Fund Portfolio
Debt Instrument [Line Items]
Long-term debt, gross		424,662			426,224
Mortgages | Fund Portfolio | Fund II
Debt Instrument [Line Items]
Long-term debt, gross		133,655			133,655
Mortgages | Fund Portfolio | Fund III
Debt Instrument [Line Items]
Long-term debt, gross		35,970
Mortgages | Fund Portfolio | Fund IV
Debt Instrument [Line Items]
Long-term debt, gross	[3]	146,091			146,230
Unsecured Debt
Debt Instrument [Line Items]
Net unamortized debt issuance costs		(4,723)			(5,076)
Unsecured notes payable, net		647,101			696,134
Line of Credit
Debt Instrument [Line Items]
Unsecured notes payable, net		172,587			168,287
Fixed Rate | Mortgages | Core Portfolio
Debt Instrument [Line Items]
Long-term debt, gross		$ 193,344			$ 193,838
Fixed Rate | Mortgages | Core Portfolio | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	[4]	5.89%			5.89%
Maturity Date		2035-04
Fixed Rate | Mortgages | Core Portfolio | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	[4]	3.99%			3.88%
Maturity Date		2024-02
Fixed Rate | Unsecured Debt | Core Portfolio | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	[4]				5.11%
Variable Rate Debt | Core Portfolio
Debt Instrument [Line Items]
Basis spread on variable rate		4.53%
Variable Rate Debt | Fund Portfolio | LIBOR | Fund IV | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		3.65%
Variable Rate Debt | Fund Portfolio | LIBOR | Fund IV | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Variable Rate Debt | Fund Portfolio | SOFR | Fund II
Debt Instrument [Line Items]
Basis spread on variable rate		2.61%
Variable Rate Debt | Fund Portfolio | SOFR | Fund III
Debt Instrument [Line Items]
Basis spread on variable rate		3.35%
Variable Rate Debt | Fund Portfolio | SOFR | Fund V | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		2.76%
Variable Rate Debt | Fund Portfolio | SOFR | Fund V | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.61%
Variable Rate Debt | Mortgages | SOFR | Fund II
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	2.61%			2.61%
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund IV | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	[3],[4]	3.65%			3.65%
Maturity Date	[3]	2026-06
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund IV | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	[3],[4]	2.25%			2.25%
Maturity Date	[3]	2023-04
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V
Debt Instrument [Line Items]
Basis spread on variable rate	[4]				1.85%
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V | Maximum
Debt Instrument [Line Items]
Maturity Date		2026-11
Variable Rate Debt | Mortgages | Fund Portfolio | LIBOR | Fund V | Minimum
Debt Instrument [Line Items]
Maturity Date		2023-05
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund II
Debt Instrument [Line Items]
Maturity Date		2025-08
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund III
Debt Instrument [Line Items]
Maturity Date		2023-07
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund III | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	[4]				3.35%
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund V
Debt Instrument [Line Items]
Basis spread on variable rate	[4]				2.76%
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund V | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	2.76%
Variable Rate Debt | Mortgages | Fund Portfolio | SOFR | Fund V | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	1.61%
Variable Rate Debt | Mortgages | Variable Rate | SOFR | Fund III | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	3.35%
Variable Rate Unsecured Term Loans | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Long-term debt, gross		$ 650,000			$ 650,000
Variable Rate Unsecured Term Loans | Unsecured Debt | Core Portfolio | Maximum
Debt Instrument [Line Items]
Interest rate, stated percentage	[4]	5.24%
Maturity Date		2029-07
Variable Rate Unsecured Term Loans | Unsecured Debt | Core Portfolio | Minimum
Debt Instrument [Line Items]
Interest rate, stated percentage	[4]	3.72%			3.74%
Maturity Date		2026-06
Variable Rate Unsecured Term Loans | Line of Credit | Core Portfolio
Debt Instrument [Line Items]
Maturity Date					2025-06
Variable Rate Unsecured Term Loans | Line of Credit | Core Portfolio | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	1.50%			1.50%
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,824			$ 51,210
Subscription Line | Unsecured Debt | Fund Portfolio | SOFR | Fund V
Debt Instrument [Line Items]
Basis spread on variable rate	[4]	1.86%			1.86%
Maturity Date		2023-05

[1] Includes $1,207.5 million and $1,264.0 million, respectively, of variable-rate debt that has been fixed with interest rate swap agreements as of the periods presented.

[2] Includes $144.5 million and $103.8 million, respectively, of variable-rate debt that is subject to interest cap agreements as of the periods presented.

[3] Includes the outstanding balance on the Fund IV secured bridge facility of $39.2 million at each of March 31, 2023 and December 31, 2022.

[4] At March 31, 2023, the stated rates ranged from 4.53% for Core variable-rate debt; SOFR + 2.61% for Fund II variable-rate debt; SOFR + 3.35% for Fund III variable-rate debt; LIBOR + 2.25% to LIBOR + 3.65% for Fund IV variable-rate debt; SOFR + 1.61% to SOFR + 2.76% for Fund V variable-rate debt; 3.72%-5.24% for Core variable-rate unsecured term loans; and SOFR + 1.50% for Core variable-rate unsecured lines of credit.