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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 154.0 $ 132.6 $ 114.1
Future amortization expense, 2020 154.0    
Future amortization expense, 2021 154.0    
Future amortization expense, 2022 154.0    
Future amortization expense, 2023 154.0    
Future amortization expense, 2024 $ 154.0