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Segmental Reporting - Summary of Segment Depreciation and Amortization (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Summary of segment depreciation and amortization |  |  |  |
Depreciation | $ 2.1 | $ 1.7 | $ 4.4 | $ 3.3
Amortization | 2.1 | 1.0 | 4.2 | 2.0
Operating Segments [Member] | Fuel Specialties [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 0.6 | 0.5 | 1.2 | 1.0
Amortization | 1.6 | 0.5 | 3.2 | 1.0
Operating Segments [Member] | Performance Chemicals [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 0.8 | 0.6 | 1.7 | 1.2
Amortization | 0.3 | 0.4 | 0.7 | 0.7
Operating Segments [Member] | Octane Additives [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 0.2 | 0.2 | 0.4 | 0.3
Amortization | 0.2 | 0.1 | 0.3 | 0.3
Corporate, Non-Segment [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | $ 0.5 | $ 0.4 | $ 1.1 | $ 0.8

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: 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=31042434&loc=d3e3602-108585 + Details
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- Details
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