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Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Variable Interest Entities [Line Items] |  |
Fixed income securities, amortized cost | $ 289,712 | $ 341,685
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 260 | 643
Corporate Obligations [Member] |  |
Variable Interest Entities [Line Items] |  |
Fixed income securities, amortized cost | 92,990 | 92,694
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 107 | 262
Municipal Bonds [Member] |  |
Variable Interest Entities [Line Items] |  |
Fixed income securities, amortized cost | 14,646 | 9,394
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | $ 7 | $ 13

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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