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Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]        
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount $ (1.4) $ (1.5) $ (1.4) $ (1.5)