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Business Restructuring - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) Employees
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring expenses | $ 1,061,000 |  |  | $ 1,061,000
Ethoxylation Assets [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Depreciation expense |  | $ 1,084,000 |  |
Longford Mills [Member] | Surfactants [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Number positions eliminated | Employees |  |  |  | 30
Restructuring expenses | 1,061,000 |  |  | $ 1,061,000
Depreciation expense | $ 843,000 |  |  | $ 1,927,000
Longford Mills [Member] | Surfactants [Member] | Scenario Forecast [Member] |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring expenses |  |  | $ 3,000,000 |
Depreciation expense |  |  | $ 2,600,000 |

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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=66902209&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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