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Acquisition of European Differentiated Surfactants business - Schedule of Total Purchase Price and Estimated Allocation of Purchase Price to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Purchase price, net of cash acquired | $ 197.4 | $ 0.0 | $ 98.7
Goodwill and Other Intangible Assets [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price, net of cash acquired | 107.4 |  |
Fixed Assets [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price, net of cash acquired | 76.5 |  |
Other Net Assets Acquired [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price, net of cash acquired | $ 15.3 |  |

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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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