Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Line Items]
Operating lease right-of-use assets	$ 33.9	$ 40.9	$ 37.6
Operating lease liabilities	$ 34.0	$ 41.3	$ 38.0
Operating lease, weighted average remaining lease term	5 years
Finance lease, weighted average remaining lease term	2 years 10 months 24 days
Operating lease, weighted average discount rate, percent	5.21%
Finance lease, weighted average discount rate, percent	6.19%
Minimum [Member]
Leases [Line Items]
Operating and Financing leases, remaining lease terms	1 year
Maximum [Member]
Leases [Line Items]
Operating and Financing leases, remaining lease terms	12 years