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Goodwill and Other Intangibles - Aggregate Amortization Expense Recognized (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]        
Aggregate amortization expense $ 1,110 $ 1,524 $ 3,647 $ 4,916