Fair Value Measurement and Disclosures - Summary of Quantitative Measures used to Determine the Fair Values of The Level III Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 2,001,134	$ 1,577,705
Series I
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	312,998	305,789
Series II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,688,136	1,271,916
Level III
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,454,790	1,068,004
Level III \| Series I
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	227,545	207,000
Level III \| Series II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,227,245	861,004
Level III \| Asset Backed Debt Securities \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	719,573	300,599
Level III \| Asset Backed Debt Securities \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	220,049	52,268
Level III \| Asset Backed Debt Securities \| Valuation Technique Recovery Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	340
Level III \| Asset Backed Debt Securities \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	11,758
Level III \| Asset Backed Debt Securities \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	281,550	418,802
Level III \| Asset Backed Debt Securities \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	13
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	112,549	58,262
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	34,418	10,131
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique Recovery Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	53
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,839
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	44,038	81,172
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	607,024	242,337
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	185,631	42,137
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique Recovery Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	287
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	9,919
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	237,512	$ 337,630
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 11
Level III \| Asset Backed Debt Securities \| Series II \| Measurement Input, P/E Multiple \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	5.25%
Level III \| Asset Backed Debt Securities \| Series II \| Measurement Input , Estimated Proceeds \| Valuation Technique Recoverability \| Guideline Public Company \| Option Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	0.00%
Level III \| Asset Backed Debt Securities \| Series II \| Measurement Input, TEV/LTM Revenue Multiple \| Valuation Technique Recoverability \| Guideline Public Company \| Option Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	4.00%
Level III \| Asset Backed Debt Securities \| Series II \| Measurement Input, Volatility \| Valuation Technique Recoverability \| Guideline Public Company \| Option Model
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	55.00%
Level III \| Asset Backed Debt Securities \| Series II \| Minimum \| Measurement Input, Discount Rate \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	4.86%	4.75%
Level III \| Asset Backed Debt Securities \| Series II \| Maximum \| Measurement Input, Discount Rate \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	23.50%	17.00%
Level III \| Asset Backed Debt Securities \| Series II \| Weighted Average \| Measurement Input, Discount Rate \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average	0.0862	0.0799
Level III \| Equity & Other Investments \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 926
Level III \| Equity & Other Investments \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	157,705	$ 160,974
Level III \| Equity & Other Investments \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	22,273	90,692
Level III \| Equity & Other Investments \| Series I \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	145
Level III \| Equity & Other Investments \| Series I \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	24,667	31,199
Level III \| Equity & Other Investments \| Series I \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,483	17,578
Level III \| Equity & Other Investments \| Series II \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	781
Level III \| Equity & Other Investments \| Series II \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	133,038	129,775
Level III \| Equity & Other Investments \| Series II \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 18,790	73,114
Level III \| Equity & Other Investments \| Series II \| Measurement Input, Discount Rate \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range	11.25%
Level III \| Equity & Other Investments \| Series II \| Weighted Average \| Measurement Input, Discount Rate \| Valuation Technique, Discounted Cash Flow
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average	0.1125
Level III \| Derivative Assets, at Fair Value \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 40,603	44,653
Level III \| Derivative Assets, at Fair Value \| Series I \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	6,351	8,655
Level III \| Derivative Assets, at Fair Value \| Series II \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 34,252	35,998
Level III \| Warrants \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		16
Level III \| Warrants \| Series I \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		3
Level III \| Warrants \| Series II \| Valuation Technique Guideline Public Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value		$ 13