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Information for Financial Instruments on Which Fair Value Option was Elected (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	$ (57,315)	$ (60,653)
Fair value of financial instruments more than one day past due	1,313	1,345
Debt Securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	(54,072)	(52,577)
Corporate Loans
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	(3,495)	(8,751)
Fair value of financial instruments more than one day past due	1,313	1,345
Loans and Receivables
Fair Value, Option, Quantitative Disclosures [Line Items]
Excess (Deficiency) of fair value over uncollected principal	252	675
Fair value of financial instruments more than one day past due	$ 0	$ 0

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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
-Paragraph 30
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-30

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-31

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-32

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