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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
	Mar. 31, 2023	Mar. 31, 2022
Income Tax Disclosure [Abstract]
Expected tax provision at weighted average tax rate	$ 644	$ (3,819)
Adjustments:
Dividend exclusion	(17)	(22)
Change in tax status	0	0
Parent income treated as partnership for tax	(196)	243
Other	142	185
Total income tax expense (benefit)	$ 573	$ (3,413)
Expected tax provision at weighted average	21.00%	21.00%
Adjustments:
Dividend exclusion, % of Pre-Tax Income	(0.50%)	0.10%
Change in tax status, % of Pre-Tax Income	0.00%	0.00%
Parent (income) loss treated as partnership for tax, % of Pre-Tax Income	(6.40%)	(1.30%)
Other, % of Pre-Tax Income	4.60%	(1.00%)
Effective income tax expense (benefit)	18.70%	18.80%

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