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Segmental Reporting and Geographical Area Data - Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 960.9 us-gaap_SalesRevenueNet | $ 818.8 us-gaap_SalesRevenueNet | $ 776.4 us-gaap_SalesRevenueNet
Gross profit | 302.0 us-gaap_GrossProfit | 255.2 us-gaap_GrossProfit | 236.4 us-gaap_GrossProfit
Operating income | 112.5 us-gaap_OperatingIncomeLoss | 90.6 us-gaap_OperatingIncomeLoss | 96.5 us-gaap_OperatingIncomeLoss
Identifiable assets at year end | 999.9 us-gaap_Assets | 794.7 us-gaap_Assets | 579.4 us-gaap_Assets
Fair value of contingent consideration | 1.9 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Impairment of Octane Additives segment goodwill | 0 us-gaap_GoodwillImpairmentLoss | (1.3)us-gaap_GoodwillImpairmentLoss | (1.2)us-gaap_GoodwillImpairmentLoss
Fuel Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Identifiable assets at year end | 676.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 446.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 356.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Impairment of Octane Additives segment goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |
Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Identifiable assets at year end | 181.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 176.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 113.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Impairment of Octane Additives segment goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |
Octane Additives [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Identifiable assets at year end | 29.2 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 42.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 48.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Impairment of Octane Additives segment goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (1.3)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember |
Operating Segments [Member] | Fuel Specialties [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 682.2 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 567.4 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 527.2 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Gross profit | 219.0 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 181.1 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 158.7 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Operating income | 104.4 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 92.7 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 87.6 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Operating Segments [Member] | Performance Chemicals [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 223.5 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 192.4 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 179.6 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Gross profit | 54.4 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 46.3 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 43.8 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Operating income | 25.6 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 23.6 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 24.3 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Operating Segments [Member] | Octane Additives [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 55.2 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 59.0 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 69.6 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Gross profit | 28.6 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 27.8 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 33.9 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Operating income | 22.6 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 21.5 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 26.0 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Segment Reconciling Items [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Pension credit/(charge) | (3.3)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (2.3)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (1.6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Fair value of contingent consideration | 1.9 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Impairment of Octane Additives segment goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (1.3)us-gaap_GoodwillImpairmentLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (1.2)us-gaap_GoodwillImpairmentLoss / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Corporate, Non-Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Identifiable assets at year end | 112.8 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 129.5 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | 60.5 us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember
Corporate costs | $ (38.7)iosp_CorporateCosts / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ (43.6)iosp_CorporateCosts / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ (38.6)iosp_CorporateCosts / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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