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Realized and Net Change in Unrealized Gains (Losses) on Financial Instruments on Financial Instruments on Which Fair Value Option was Elected (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Realized Gains (Losses) | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	$ (2,169)	$ (2,196)
Realized Gains (Losses) | Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(1,604)	(763)
Realized Gains (Losses) | Equity and Preferred Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	2,281	1,696
Realized Gains (Losses) | Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(2,846)	(3,129)
Net Change In Unrealized Gains (Losses) | Debt Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(729)	(1,831)
Net Change In Unrealized Gains (Losses) | Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	19,048	(46,765)
Net Change In Unrealized Gains (Losses) | Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	(408)	(303)
Net Change In Unrealized Gains (Losses) | Liabilities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	977	4,690
Net Change In Unrealized Gains (Losses) | Equity and Preferred Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	17,729	(45,113)
Net Change In Unrealized Gains (Losses) | Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	2,456	482
Net Change In Unrealized Gains (Losses) | CLO Notes Payable
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	600	2,464
Net Change In Unrealized Gains (Losses) | Corporate Treasury Commitments
Fair Value, Option, Quantitative Disclosures [Line Items]
Realized and net change in unrealized gains (losses) on financial instruments	$ 377	$ 2,226

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- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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