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Business Restructuring - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2018 USD ($) Employees | Mar. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |
Business restructuring | $ 358,000 | $ 786,000
Other Expense [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Business restructuring | 358,000 |
Longford Mills [Member] | Surfactants [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Business restructuring | $ 5,197,000 |
Number positions eliminated | Employees | 30 |
Longford Mills [Member] | Surfactants [Member] | Termination Benefits [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Business restructuring | $ 1,594,000 |
Longford Mills [Member] | Surfactants [Member] | Other Expense [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Business restructuring | $ 3,603,000 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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