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Segmental Reporting - Segment Reporting (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |
Net sales | $ 269.2 us-gaap_SalesRevenueNet | $ 220.7 us-gaap_SalesRevenueNet
Gross profit | 81.8 us-gaap_GrossProfit | 65.7 us-gaap_GrossProfit
Operating income | 23.4 us-gaap_OperatingIncomeLoss | 18.0 us-gaap_OperatingIncomeLoss
Pension charge | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost | (0.8)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Fair value of contingent consideration | (3.5)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Operating Segments [Member] | Fuel Specialties [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 199.4 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 164.2 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Gross profit | 61.5 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 52.0 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Operating income | 23.5 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 25.8 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 | 57.6 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 56.1 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Gross profit | 14.5 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 13.6 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Operating income | 6.4 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 6.5 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 | 12.2 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0.4 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Gross profit | 5.8 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | 0.1 us-gaap_GrossProfit / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Operating income | 5.1 us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (1.2)us-gaap_OperatingIncomeLoss / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Segment Reconciling Items [Member] |  |
Segment Reporting Information [Line Items] |  |
Pension charge | 0 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | (0.8)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Fair value of contingent consideration | (3.5)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember
Corporate, Non-Segment [Member] |  |
Segment Reporting Information [Line Items] |  |
Corporate costs | $ (8.1)iosp_CorporateCosts / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember | $ (12.3)iosp_CorporateCosts / us-gaap_ConsolidationItemsAxis = us-gaap_CorporateNonSegmentMember

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- Definition Corporate costs. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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