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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Accrued net interest and penalties	$ 0.3			$ 0.3	$ 0.2
Unrecognized tax benefits, income tax interest and penalties accrued	0.6		$ 0.3	0.6
Unrecognized tax benefits, interest and penalties	3.2		2.5	3.2
Unrecognized tax benefit	2.6		2.2	$ 2.6		$ 2.2
Income tax examination, description				The Company and its U.S. subsidiaries remain open to examination by the IRS for years 2015 onwards under the statute of limitations. The Company’s subsidiaries in foreign tax jurisdictions are open to examination including France (2014 onwards), Germany (2015 onwards), Switzerland (2015 onwards) and the United Kingdom (2016 onwards).
Italian Tax Authorities [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefit	0.5	$ 0.4	0.5	$ 0.5
Income tax interest expense	$ 0.2	$ 0.1	$ 0.2
Italy [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2011
Italy [Member] | Latest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2013
France [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2014
Germany [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2015
Switzerland [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2015
United Kingdom [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2016
United States [Member] | Earliest Tax Year [Member]
Income Tax Contingency [Line Items]
Open tax year				2015

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