Debt - Unsecured Notes Payable - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Sep. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Jul. 29, 2022	Jun. 30, 2022	Apr. 06, 2022
Debt Instrument [Line Items]
Long-term debt outstanding	[1],[2]		$ 1,758,133	$ 1,805,414
Maximum borrowing capacity			900,000
Letters of credit, outstanding amount			7,000	7,000
Fund IV
Debt Instrument [Line Items]
Long-term debt outstanding			39,200	39,200
Core Portfolio
Debt Instrument [Line Items]
Refinanced amount		$ 25,400
Mortgages
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 42,200
Mortgages | Fund Portfolio
Debt Instrument [Line Items]
Long-term debt outstanding			424,662	426,224
Mortgages | Fund Portfolio | Fund II
Debt Instrument [Line Items]
Long-term debt outstanding			133,655	133,655
Mortgages | Fund Portfolio | Fund IV
Debt Instrument [Line Items]
Long-term debt outstanding	[3]		146,091	146,230
$175 Million Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity			175,000	175,000			$ 175,000
Remaining borrowing capacity			175,000
$400 Million Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity			400,000
$400 Million Term Loan | Unsecured Debt | Core Portfolio
Debt Instrument [Line Items]
Long-term debt outstanding			400,000	400,000
Subscription Line | Unsecured Debt | Fund V
Debt Instrument [Line Items]
Maximum borrowing capacity			100,000
Subscription Line | Unsecured Debt | Fund V | Letter of Credit
Debt Instrument [Line Items]
Letters of credit, outstanding amount			7,000	7,000
Subscription Line | Unsecured Debt | Fund Portfolio | Fund V
Debt Instrument [Line Items]
Long-term debt outstanding			1,824	51,210
Remaining borrowing capacity			91,200	41,800
$75 million Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 75,000	$ 75,000	$ 75,000
Remaining borrowing capacity					$ 75,000

[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.