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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Liabilities [Line Items]        
Amortization expense $ 4.0 $ 3.9 $ 11.8 $ 9.6