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Segmental Reporting - Summary of Segment Depreciation and Amortization (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Summary of segment depreciation and amortization |  |
Depreciation | $ 3.2 us-gaap_Depreciation | $ 2.8 us-gaap_Depreciation
Amortization | 5.1 us-gaap_AmortizationOfIntangibleAssets | 4.4 us-gaap_AmortizationOfIntangibleAssets
Operating Segments [Member] | Fuel Specialties [Member] |  |
Summary of segment depreciation and amortization |  |
Depreciation | 1.9 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 1.2 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Amortization | 3.2 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 2.2 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Operating Segments [Member] | Performance Chemicals [Member] |  |
Summary of segment depreciation and amortization |  |
Depreciation | 0.8 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0.9 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Amortization | 1.0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 1.3 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Operating Segments [Member] | Octane Additives [Member] |  |
Summary of segment depreciation and amortization |  |
Depreciation | 0.1 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0.1 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Corporate, Non-Segment [Member] |  |
Summary of segment depreciation and amortization |  |
Depreciation | 0.4 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 0.6 us-gaap_Depreciation / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Amortization | $ 0.9 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ 0.9 us-gaap_AmortizationOfIntangibleAssets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |