Commitments and Contingencies - Additional Information (Details) £ in Thousands				3 Months Ended		12 Months Ended
	Oct. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Oct. 29, 2021 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2023 GBP (£)	Dec. 31, 2022 USD ($)
Other Commitments [Line Items]
Unfunded Commitments for Capital Contributions				$ 2,592,000
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount				3,530,000
Foreign Exchange Forward [Member]
Other Commitments [Line Items]
Derivative asset notional amount				36,903,000			£ 30,000
Derivative asset, current				205,000
Real Estate Capital Advisory [Member]
Other Commitments [Line Items]
Purchase Of Noncontrolling Interest		$ 54,297,000
Cash and Cash Equivalents | Real Estate Capital Advisory [Member]
Other Commitments [Line Items]
Purchase Of Noncontrolling Interest				715,000	$ 27,710,000	$ 6,000,000
Payable to Employees and Related Parties [Member] | Real Estate Capital Advisory [Member]
Other Commitments [Line Items]
Noncontrolling Interest, Purchase of Interest, Contingent Consideration, Liability, Current				5,122,000
Other Current Liabilities [Member] | Real Estate Capital Advisory [Member]
Other Commitments [Line Items]
Noncontrolling Interest, Purchase of Interest, Contingent Consideration, Liability, Current								$ 1,083,000
Other Noncurrent Liabilities | Real Estate Capital Advisory [Member]
Other Commitments [Line Items]
Noncontrolling Interest, Purchase of Interest, Contingent Consideration, Liability, Noncurrent								$ 6,119,000
Secured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity			$ 30,000,000
Short-Term Borrowings				0
Secured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.50%
Unsecured Line of Credit [Member] | PNC Bank [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity			$ 55,000,000
Short-Term Borrowings				0
Unsecured Line of Credit [Member] | PNC Bank [Member] | EGL [Member]
Other Commitments [Line Items]
Maximum Borrowing Capacity	$ 75,000,000
Short-Term Borrowings				$ 0
Unsecured Line of Credit [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate			1.80%
Unsecured Line of Credit [Member] | PNC Bank [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | EGL [Member]
Other Commitments [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.91%