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Segmental Reporting and Geographical Area Data - Segment Reporting on Basis of Geographical Location (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | $ 960.9 us-gaap_SalesRevenueNet | $ 818.8 us-gaap_SalesRevenueNet | $ 776.4 us-gaap_SalesRevenueNet
Income before income taxes | 110.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 92.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 93.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Long-lived assets at year end | 263.0 us-gaap_NoncurrentAssets | 189.1 us-gaap_NoncurrentAssets | 71.7 us-gaap_NoncurrentAssets
Identifiable assets at year end | 999.9 us-gaap_Assets | 794.7 us-gaap_Assets | 579.4 us-gaap_Assets
United States [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 468.6 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 276.1 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 274.1 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Income before income taxes | 15.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US | 10.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US | 5.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets at year end | 197.9 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 148.2 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 31.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Identifiable assets at year end | 449.3 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 291.7 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US | 174.1 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
United Kingdom [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 486.1 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | 502.4 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB | 475.1 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Income before income taxes | 57.8 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB | 43.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB | 36.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB
Long-lived assets at year end | 54.1 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB | 29.4 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB | 28.7 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB
Identifiable assets at year end | 216.4 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB | 261.5 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB | 192.1 us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB
Rest of Europe [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 146.9 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 129.1 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 142.8 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Income before income taxes | 39.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 40.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 52.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Long-lived assets at year end | 10.4 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 11.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 11.5 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Identifiable assets at year end | 39.0 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 53.2 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember | 63.8 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Rest of World [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 21.4 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0.2 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0.5 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Income before income taxes | (1.4)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Long-lived assets at year end | 0.6 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0 us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Identifiable assets at year end | 19.1 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0.4 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember | 0.4 us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Sales Between Areas [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | (162.1)us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_SalesBetweenGeographicalAreasMember | (89.0)us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_SalesBetweenGeographicalAreasMember | (116.1)us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_SalesBetweenGeographicalAreasMember
Octane Additives [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Income before income taxes | 0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (1.3)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember | (1.2)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
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
Goodwill [Member] |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Identifiable assets at year end | $ 276.1 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember | $ 187.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember | $ 149.0 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember

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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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Balance Type: | debit
Period Type: | instant

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 + Details
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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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