Securitized Debt Obligations, Net (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) loan	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) loan	Dec. 31, 2023	Mar. 31, 2025 USD ($)
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			62		46
Principal balance	$ 2,502,834		$ 2,502,834		$ 1,936,967
Principal Balance, collateral assets	3,204,886		3,204,886		2,552,403
Book Value	2,493,011		2,493,011		1,936,956
Book Value, collateral assets	3,204,886		$ 3,204,886		$ 2,552,403
Wtd. Avg. Yield/Cost, loan obligation			1.95%		1.57%
Wtd. Avg. Yield/Cost, collateral assets			3.15%		2.98%
Interest expense on debt	40,300	$ 40,200	$ 67,900	$ 81,700
2025 FL5 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			1
Principal balance	831,250		$ 831,250
Book Value	821,427		$ 821,427
Wtd. Avg. Yield/Cost, loan obligation			2.15%
2025 FL5 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			19
Principal Balance, collateral assets	997,805		$ 997,805				$ 1,000,000
Book Value, collateral assets	997,805		$ 997,805
Wtd. Avg. Yield/Cost, collateral assets			3.44%
2021 FL4 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			1		1
Principal balance	621,149		$ 621,149		$ 785,453
Book Value	621,149		$ 621,149		$ 785,442
Wtd. Avg. Yield/Cost, loan obligation			1.44%		1.39%
2021 FL4 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			19		22
Principal Balance, collateral assets	768,996		$ 768,996		$ 952,764
Book Value, collateral assets	768,996		$ 768,996		$ 952,764
Wtd. Avg. Yield/Cost, collateral assets			2.86%		2.95%
2020 FL3 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			1		1
Principal balance	464,258		$ 464,258		$ 552,664
Book Value	464,258		$ 464,258		$ 552,663
Wtd. Avg. Yield/Cost, loan obligation			2.50%		1.92%
2020 FL3 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			12		12
Principal Balance, collateral assets	624,917		$ 624,917		$ 743,914
Book Value, collateral assets	624,917		$ 624,917		$ 743,914
Wtd. Avg. Yield/Cost, collateral assets			2.79%		2.92%
2020 FL2 Senior Collateralized Loan Obligation | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			1		1
Principal balance	586,177		$ 586,177		$ 598,850
Book Value	586,177		$ 586,177		$ 598,851
Wtd. Avg. Yield/Cost, loan obligation			1.76%		1.50%
2020 FL2 Underlying Collateral Assets | Securitized debt obligations, net
Debt Instrument [Line Items]
Count | loan			12		12
Principal Balance, collateral assets	813,168		$ 813,168		$ 855,725
Book Value, collateral assets	$ 813,168		$ 813,168		$ 855,725
Wtd. Avg. Yield/Cost, collateral assets			2.72%		2.79%