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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
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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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