Fair Value Measurement and Disclosures - Summary of Quantitative Measures used to Determine the Fair Values of The Level III Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 1,937,932	$ 1,577,705
Series I
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	311,354	305,789
Series II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,626,578	1,271,916
Level III
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,480,686	1,068,004
Level III \| Series I
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	237,892	207,000
Level III \| Series II
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,242,794	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	741,539	300,599
Level III \| Asset Backed Debt Securities \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	99,503	52,268
Level III \| Asset Backed Debt Securities \| Valuation Technique Recovery Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,869
Level III \| Asset Backed Debt Securities \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	13,218
Level III \| Asset Backed Debt Securities \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	373,382	418,802
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	119,138	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	15,986	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	300
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	2,124
Level III \| Asset Backed Debt Securities \| Series I \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	59,989	81,172
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	622,401	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	83,517	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	1,569
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique Cost Approach
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	11,094
Level III \| Asset Backed Debt Securities \| Series II \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 313,393	$ 337,630
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	0.0833	0.0799
Level III \| Equity & Other Investments \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 176,638	$ 160,974
Level III \| Equity & Other Investments \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	22,905	90,692
Level III \| Equity & Other Investments \| Series I \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	28,379	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	3,680	17,578
Level III \| Equity & Other Investments \| Series II \| Valuation Technique, Transactional Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	148,259	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	19,225	73,114
Level III \| Derivative Assets, at Fair Value \| Valuation Technique, Broker Quote
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	51,632	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	8,296	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	$ 43,336	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