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Provision for income taxes: - Provision for Income Taxes (Parenthetical) (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Disclosure [Abstract]        
U.S. federal statutory income tax rate 21.00% 21.00% 21.00% 21.00%