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Changes in Level 3 Investments Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value Disclosures [Abstract]
Beginning balance	$ 4,335	$ 4,288	$ 4,571	$ 2,769
Included in accumulated other comprehensive income	(3)	23	7	15
Included in earnings attributable to realized gains / losses	(113)	(102)	(172)	(170)
Transfers into level 3	0	607	0	857
Amortization of bond premium and discount, net	2	2	4	2
Purchases	39	55	113	1,479
Sales	(473)	(523)	(736)	(602)
Ending balance	3,787	4,350	3,787	4,350
Gains (losses) included in earnings attributable to the change in unrealized gains (losses) related to assets still held at end of reporting period	$ (103)	$ (9)	$ (162)	$ (14)

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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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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
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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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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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