Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense associated with identifiable intangible assets	$ 0.8	$ 0.4	$ 0.4
Estimated total amortization expense 2020	3.3
Estimated total amortization expense 2021	5.7
Estimated total amortization expense 2022	6.9
Estimated total amortization expense 2023	7.9
Estimated total amortization expense 2024	$ 6.7