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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Disclosure [Abstract]        
Expected tax provision at weighted average tax rate $ 2,459 $ (2,686) $ 3,103 $ (6,505)
Adjustments:        
Dividend exclusion (21) (24) (38) (46)
Parent (income) loss treated as partnership for tax (146) 1,827 (342) 2,070
Other 79 257 221 442
Total deferred income tax expense (benefit) $ 2,371 $ (626) $ 2,944 $ (4,039)
Expected tax provision at weighted average 21.00% 21.00% 21.00% 21.00%
Adjustments:        
Dividend exclusion, % of Pre-Tax Income (0.20%) 0.20% (0.30%) 0.10%
Parent (income) loss treated as partnership for tax, % of Pre-Tax Income (1.20%) (14.30%) (2.30%) (6.70%)
Other, % of Pre-Tax Income 0.70% (2.00%) 1.50% (1.40%)
Effective income tax expense (benefit) 20.30% 4.90% 19.90% 13.00%