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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Beginning balance	$ 3,787	$ 4,350	$ 4,571	$ 2,769
Included in accumulated other comprehensive income	3	(45)	10	(29)
Included in earnings attributable to realized gains / losses	24	(4)	(148)	(175)
Transfers into level 3	0	0	0	857
Amortization of bond premium and discount, net	1	2	5	4
Purchases	182	596	295	2,075
Sales	(428)	(652)	(1,164)	(1,254)
Ending balance	3,569	4,247	3,569	4,247
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) related to assets still held at end of reporting period	$ 31	$ (4)	$ (131)	$ (19)

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Fair value measurement with unobservable inputs reconciliation recurring basis asset amortization of bond premium and discount, net.

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- Definition

Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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-Topic 820
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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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