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Segment Reporting - Summary of Segment Depreciation and Amortization (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Summary of segment depreciation and amortization |  |  |  |
Depreciation | $ 6.3 | $ 5.5 | $ 12.0 | $ 11.3
Amortization | 5.8 | 6.9 | 11.5 | 13.6
Operating Segments [Member] | Fuel Specialties [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 1.0 | 0.9 | 1.9 | 1.9
Operating Segments [Member] | Performance Chemicals [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 2.7 | 2.5 | 5.2 | 5.2
Amortization | 2.2 | 2.2 | 4.4 | 4.5
Operating Segments [Member] | Oilfield Services [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 1.8 | 1.6 | 3.5 | 3.1
Amortization | 2.7 | 2.8 | 5.3 | 5.4
Operating Segments [Member] | Octane Additives [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 0.3 | 0.3 | 0.6 | 0.6
Corporate, Non-Segment [Member] |  |  |  |
Summary of segment depreciation and amortization |  |  |  |
Depreciation | 0.5 | 0.2 | 0.8 | 0.5
Amortization | $ 0.9 | $ 1.9 | $ 1.8 | $ 3.7

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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