Securitized Debt Obligations, Net (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan
Debt Instrument [Line Items]
Interest expense on securitized debt obligations	$ 171,400	$ 87,600
Senior CLO Securities Outstanding
Debt Instrument [Line Items]
Count | loan	3	3
Principal Balance	$ 2,507,514	$ 2,673,541
Book Value	$ 2,505,417	$ 2,664,010
Senior CLO Securities Outstanding | 2021 FL4 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	1	1
Principal Balance	$ 803,750	$ 803,750
Book Value	$ 801,800	$ 799,626
Senior CLO Securities Outstanding | 2020 FL3 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	1	1
Principal Balance	$ 714,352	$ 808,750
Book Value	$ 714,352	$ 806,757
Senior CLO Securities Outstanding | 2020 FL2 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	1	1
Principal Balance	$ 989,412	$ 1,061,041
Book Value	$ 989,265	$ 1,057,627
Underlying Collateral Assets
Debt Instrument [Line Items]
Count | loan	56	63
Principal Balance	$ 3,151,889	$ 3,317,916
Book Value	$ 3,151,889	$ 3,317,916
Underlying Collateral Assets | 2021 FL4 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	26	30
Principal Balance	$ 1,000,000	$ 1,000,000
Book Value	$ 1,000,000	$ 1,000,000
Underlying Collateral Assets | 2020 FL3 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	15	16
Principal Balance	$ 905,602	$ 1,000,000
Book Value	$ 905,602	$ 1,000,000
Underlying Collateral Assets | 2020 FL2 Collateralized Loan Obligation
Debt Instrument [Line Items]
Count | loan	15	17
Principal Balance	$ 1,246,287	$ 1,317,916
Book Value	$ 1,246,287	$ 1,317,916
LIBOR | Senior CLO Securities Outstanding
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	1.79%	1.73%
LIBOR | Senior CLO Securities Outstanding | 2021 FL4 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	1.70%	1.57%
LIBOR | Senior CLO Securities Outstanding | 2020 FL3 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	2.18%	2.14%
LIBOR | Senior CLO Securities Outstanding | 2020 FL2 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	1.57%	1.55%
LIBOR | Underlying Collateral Assets
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	2.99%	3.38%
LIBOR | Underlying Collateral Assets | 2021 FL4 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	3.28%	3.47%
LIBOR | Underlying Collateral Assets | 2020 FL3 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	2.87%	3.25%
LIBOR | Underlying Collateral Assets | 2020 FL2 Collateralized Loan Obligation
Debt Instrument [Line Items]
Wtd. Avg. Yield/Cost	2.85%	3.42%