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Components of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Deferred income tax expense (benefit):        
U.S. Federal $ 2,371 $ (626) $ 2,944 $ (4,039)
Total deferred income tax expense (benefit) 2,371 (626) 2,944 (4,039)
Total deferred income tax expense (benefit) $ 2,371 $ (626) $ 2,944 $ (4,039)