Goodwill and Other 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]
Other intangibles acquired	$ 1.5
Amortization expense of intangible assets	$ 13.0	$ 13.9	$ 14.2