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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 | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Realized Gains (Losses) | Debt Securities |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments | $ (22,240) | $ 14,399 | $ (22,783)
Realized Gains (Losses) | Assets |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments | (10,688) | 45,529 | (129,633)
Realized Gains (Losses) | Loans and Receivables |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments | (10,733) | (11,661) | (10,314)
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 | 22,285 | 42,791 | (342)
Realized Gains (Losses) | Corporate Loans |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments |  |  | (96,194)
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 | (19,490) | (14,210) | 29,143
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 | (111,292) | 42,428 | (267,604)
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 | (464) | 3,481 | (2,011)
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 | (7,508) | (383) | 229,247
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 | (91,338) | 53,157 | (67,869)
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 |  |  | (226,542)
Net Change In Unrealized Gains (Losses) | Senior Secured Notes |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments |  |  | 199,445
Net Change In Unrealized Gains (Losses) | Subordinated Notes |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments |  |  | 30,046
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 | $ (7,508) | $ (383) | (244)
Net Change In Unrealized Gains (Losses) | Other |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |
Realized and net change in unrealized gains (losses) on financial instruments |  |  | $ (325)

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