Pension Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Pension obligations European businesses	$ 15.7		$ 15.7		$ 14.2
Germany [Member] | Foreign Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net pension charge	0.2	$ 0.2	0.4	$ 0.4
Europe [Member] | Foreign Pension Plan [Member] | Performance Chemicals [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension obligations European businesses	$ 4.5		$ 4.5		$ 4.1