Securitized Debt Obligations, Net (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) loan	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023
Debt Instrument [Line Items]
Debt instrument, variable interest rate, type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR)	Secured Overnight Financing Rate (SOFR)	Secured Overnight Financing Rate (SOFR)
Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	4	3
Count | loan	65	46
Principal balance	$ 2,569,979	$ 1,936,967
Principal Balance, collateral assets	3,318,900	2,552,403
Book Value	2,559,896	1,936,956
Book Value, collateral assets	$ 3,318,900	$ 2,552,403
Wtd. Avg. Yield/Cost, loan obligation	1.88%	1.57%
Wtd. Avg. Yield/Cost, collateral assets	3.31%	2.98%
Interest expense on debt	$ 27,600	$ 157,000
2025 FL5 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	1
Principal balance	$ 831,250
Book Value	$ 821,167
Wtd. Avg. Yield/Cost, loan obligation	2.08%
2025 FL5 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	19
Principal Balance, collateral assets	$ 1,000,000
Book Value, collateral assets	$ 1,000,000
Wtd. Avg. Yield/Cost, collateral assets	3.41%
2021 FL4 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	1	1
Principal balance	$ 670,149	$ 785,453
Book Value	$ 670,149	$ 785,442
Wtd. Avg. Yield/Cost, loan obligation	1.42%	1.39%
2021 FL4 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	22	22
Principal Balance, collateral assets	$ 849,996	$ 952,764
Book Value, collateral assets	$ 849,996	$ 952,764
Wtd. Avg. Yield/Cost, collateral assets	2.90%	2.95%
2020 FL3 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	1	1
Principal balance	$ 469,730	$ 552,664
Book Value	$ 469,730	$ 552,664
Wtd. Avg. Yield/Cost, loan obligation	2.44%	1.92%
2020 FL3 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	12	12
Principal Balance, collateral assets	$ 637,509	$ 743,914
Book Value, collateral assets	$ 637,509	$ 743,914
Wtd. Avg. Yield/Cost, collateral assets	3.04%	2.92%
2020 FL2 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	1	1
Principal balance	$ 598,850	$ 598,850
Book Value	$ 598,850	$ 598,850
Wtd. Avg. Yield/Cost, loan obligation	1.65%	1.50%
2020 FL2 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan	12	12
Principal Balance, collateral assets	$ 831,395	$ 855,725
Book Value, collateral assets	$ 831,395	$ 855,725
Wtd. Avg. Yield/Cost, collateral assets	3.27%	2.79%