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Differences in Tax Provision for Financial Statement Purposes and Expected Tax Provision at Weighted Average Tax Rate (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Expected tax provision at weighted average tax rate	$ 1,987	$ 6,549	$ 5,090	$ 44
Adjustments:
Dividend exclusion	(16)	(20)	(54)	(66)
Change in tax status	0	700	0	700
Parent (income) loss treated as partnership for tax	(326)	101	(668)	2,171
Other	118	108	339	550
Total income tax expense	$ 1,763	$ 7,438	$ 4,707	$ 3,399
Expected tax provision at weighted average	21.00%	21.00%	21.00%	21.00%
Adjustments:
Dividend exclusion, % of Pre-Tax Income	(0.20%)	(0.10%)	(0.20%)	(31.40%)
Change in tax status, % of Pre-Tax Income	0.00%	2.40%	0.00%	333.30%
Parent (income) loss treated as partnership for tax, % of Pre-Tax Income	(3.40%)	0.30%	(2.80%)	1033.80%
Other, % of Pre-Tax Income	1.20%	0.30%	1.40%	261.90%
Effective income tax expense (benefit)	18.60%	23.90%	19.40%	1618.60%

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