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Debt - Mortgage and Other Notes Payable - Additional Information (Details)	3 Months Ended									12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022 USD ($) Mortgage	Sep. 30, 2022 USD ($) Mortgage	Jun. 30, 2022 USD ($) Mortgage	Mar. 31, 2022 USD ($) Mortgage	Dec. 31, 2021 USD ($) Mortgage	Sep. 30, 2021 USD ($) Mortgage	Jun. 30, 2021 USD ($) Mortgage	Mar. 31, 2021 USD ($) Mortgage	Dec. 31, 2022 USD ($) Mortgage	Dec. 31, 2021 USD ($) Mortgage	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Notes receivable, net		$ 123,903,000				$ 153,886,000				$ 123,903,000	$ 153,886,000
Mortgage Loan Principal Amount									$ 1,700,000
Maximum borrowing capacity		900,000,000.0				0				900,000,000.0	0
Initial term for mortgage loan			3 years
Repayments of debt		$ 10,300,000	$ 29,500,000	$ 22,700,000	$ 57,800,000			$ 23,500,000
Scheduled principal payment											8,600,000
Gain on debt extinguishment										$ 0	0	$ 18,339,000
Short-Term Debt, Refinanced, Amount											18,500,000
Disposed of by sale
Debt Instrument [Line Items]
Repayments of debt					$ 12,300,000				$ 6,700,000
Canton Marketplace
Debt Instrument [Line Items]
Mortgage						31,800,000					31,800,000
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative, notional amount						$ 16,700,000					16,700,000
Cash proceeds from swaps											$ 3,400,000
Bridge facility
Debt Instrument [Line Items]
LIBOR floor									0.25%
Bridge facility \| Minimum
Debt Instrument [Line Items]
LIBOR plus									2.00%
Bridge facility \| Maximum
Debt Instrument [Line Items]
LIBOR plus									2.50%
Mortgages
Debt Instrument [Line Items]
Notes receivable, net				$ 42,400,000
Number of mortgage loans \| Mortgage		3	1	2	4	2	2	5	2	10	11
Mortgage Loan Principal Reduction Amount				$ 8,600,000
Maximum borrowing capacity				42,200,000
Maturity date			Dec. 29, 2023								Aug. 11, 2022
Number of properties collateralized \| Mortgage		31				37				31	37
Loans Payable						$ 16,800,000					$ 16,800,000
Mortgages \| Canton Marketplace
Debt Instrument [Line Items]
Mortgage						$ 31,800,000					$ 31,800,000
Debt instrument, maturity date											May 01, 2023
Interest rate, stated percentage						3.35%					3.35%
Mortgages \| Monroe Marketplace
Debt Instrument [Line Items]
Mortgage						$ 29,200,000					$ 29,200,000
Maturity date											Nov. 12, 2026
Mortgages \| Subscription Line
Debt Instrument [Line Items]
Notes receivable, net					$ 99,000,000.0				$ 37,700,000
Mortgage Loan Principal Amount		$ 3,500,000			$ 1,100,000					$ 3,500,000
Mortgage Loan Interest Reserve		4,200,000								4,200,000
Mortgages \| Subscription Line 1
Debt Instrument [Line Items]
Notes receivable, net			$ 36,000,000.0			14,800,000					$ 14,800,000
Mortgage Loan Principal Amount						3,000,000.0	$ 10,200,000				3,000,000.0
Outstanding balance						$ 64,200,000					64,200,000
Repayments of Debt											$ 59,200,000	$ 79,200,000
Mortgages \| Subscription Line 2
Debt Instrument [Line Items]
Notes receivable, net		83,400,000	$ 53,100,000	$ 62,200,000				$ 125,700,000		83,400,000
Mortgage Loan Principal Amount								$ 6,500,000
SOFR
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			2.61%	2.56%
SOFR \| Mortgages \| Monroe Marketplace
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate											2.76%
Fund II
Debt Instrument [Line Items]
Maximum borrowing capacity		50,000,000.0								50,000,000.0
Single Mortgage Loan			$ 198,000,000.0
Proceeds from Sale of Mortgage Loans Held-for-sale			132,300,000
Loans Payable			26,000,000.0
Fund II \| Mortgages
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 257,900,000
Maturity date	Jul. 10, 2027
Debt Instrument, Basis Spread on Variable Rate			4.00%
Fund II \| Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 50,000,000.0
Fund II \| Unsecured Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity			40,000,000.0
Fund II \| LIBOR \| Mortgages
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate											2.75%
Fund IV
Debt Instrument [Line Items]
Repayments of debt		17,000,000.0
Core Portfolio
Debt Instrument [Line Items]
Notes receivable, net		13,500,000		$ 16,000,000.0						13,500,000
Derivative, notional amount		856,000,000								$ 856,000,000
Short-Term Debt, Refinanced, Amount			$ 25,400,000
Core Portfolio \| Disposed of by sale
Debt Instrument [Line Items]
Scheduled principal payment		$ 7,500,000