Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Liability for deferred taxes on undistributed foreign earnings	$ 0.9
Other information pertaining to income taxes	Federal net operating losses of $0.1 million will expire in 2037
State and local net operating loss carry forwards year start	2021
State and local net operating loss carry forwards year end	2040
Valuation reserve	$ 6.0	$ 5.8
Additional income tax expense (benefit)	$ (0.2)	0.2	$ 1.5
Income tax positions recognized, minimum percentage	50.00%
Expense for interest and penalties	$ 0.0	$ 0.1
Federal [Member]
Income Taxes [Line Items]
Net operating loss carry forward	0.6
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Net operating loss carry forward	49.4
Overseas Jurisdictions [Member]
Income Taxes [Line Items]
Net operating loss carry forward	$ 10.3
State and Foreign Authorities [Member]
Income Taxes [Line Items]
Open tax years	2015 2016 2017 2018 2019 2020