Commitments and Contingencies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jul. 24, 2023	Aug. 20, 2022
Loss Contingencies [Line Items]
Loan Commitments Refunded	$ 1,000,000	$ 1,400,000
Existing Secured Financing Commitments	459,300	$ 650,900
Notes Payable Repaid Date		May 27, 2021
Estimated Equity Required		$ 2,600
Commitments related to arrangements	55,000	55,000
Commitments Amount Drawn	0	0
Commitments
Loss Contingencies [Line Items]
Commitments related to arrangements	$ 50,000	$ 50,000	$ 5,000	$ 5,000
Maximum
Loss Contingencies [Line Items]
Lease Expiration Period	5 years	5 years
Claros Mortgage Trust
Loss Contingencies [Line Items]
Commitment Interest	51.00%
Commitment Amount	$ 124,900
Loans Recall Price	$ 10.00
Loan Repayment Period	6 months
Company Contribution Amount	$ 161,600	$ 159,500
Remaining capital commitment	74,400	$ 76,400
CMTG TT Participation
Loss Contingencies [Line Items]
Capital Commitment Expenses	1,100
CMTG TT Participation | Maximum
Loss Contingencies [Line Items]
Required Equity Amount	$ 100,000