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Components of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Current income tax benefit:        
U.S. Federal $ (4) $ (19) $ (4) $ (19)
Total current income tax benefit (4) (19) (4) (19)
Deferred income tax expense:        
U.S. Federal 1,767 7,457 4,711 3,418
Total deferred income tax expense 1,767 7,457 4,711 3,418
Total income tax expense $ 1,763 $ 7,438 $ 4,707 $ 3,399