Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Option to extend, term	10 years
Option to terminate, term	1 year
Weighted average remaining lease term	4 years
Weighted average discount rate	5.30%
Operating leases rent expense		$ 12.7	$ 12.2
Operating lease costs	$ 12.9
Short-term and variable lease costs	2.4
Sublease rental income	1.1
Cash payments	$ 11.8
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	8 years