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Pension and Post-Employment Benefits - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Europe [Member] | Performance Chemicals [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Post-employment obligations European businesses | $ 4.2 |  | $ 4.2 |  | $ 4.4
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net service cost, total | 0.2 | $ 0.3 | 0.7 | $ 0.9 |
Selling, General and Administrative Expenses [Member] | Germany [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Net service cost, total | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.1 |

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