Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill [Line Items]
Amortization expense associated with identifiable intangible assets	$ 2.7	$ 0.7
Estimated total amortization expense on intangible assets 2021	5.7
Estimated total amortization expense on intangible assets 2022	6.9
Estimated total amortization expense on intangible assets 2023	7.9
Estimated total amortization expense on intangible assets 2024	6.7
Estimated total amortization expense on intangible assets 2025	5.7
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Goodwill and intangible assets with indefinite lives	$ 147.4		$ 147.4