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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
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 960.9us-gaap_SalesRevenueNet	$ 818.8us-gaap_SalesRevenueNet	$ 776.4us-gaap_SalesRevenueNet
Income before income taxes	110.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	92.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	93.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Long-lived assets at year end	263.0us-gaap_NoncurrentAssets	189.1us-gaap_NoncurrentAssets	71.7us-gaap_NoncurrentAssets
Identifiable assets at year end	999.9us-gaap_Assets	794.7us-gaap_Assets	579.4us-gaap_Assets
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	468.6us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	276.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	274.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Income before income taxes	15.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US	10.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US	5.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets at year end	197.9us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	148.2us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	31.5us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Identifiable assets at year end	449.3us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US	291.7us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US	174.1us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_US
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	486.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	502.4us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB	475.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_GB
Income before income taxes	57.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB	43.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB	36.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = country_GB
Long-lived assets at year end	54.1us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	29.4us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB	28.7us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_GB
Identifiable assets at year end	216.4us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB	261.5us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB	192.1us-gaap_Assets / us-gaap_StatementGeographicalAxis = country_GB
Rest of Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	146.9us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	129.1us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	142.8us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Income before income taxes	39.3us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	40.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	52.6us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Long-lived assets at year end	10.4us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	11.5us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	11.5us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Identifiable assets at year end	39.0us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	53.2us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember	63.8us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfEuropeMember
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	21.4us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0.2us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0.5us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Income before income taxes	(1.4)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Long-lived assets at year end	0.6us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember
Identifiable assets at year end	19.1us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0.4us-gaap_Assets / us-gaap_StatementGeographicalAxis = iosp_RestOfWorldMember	0.4us-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	0us-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	29.2us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember	42.0us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember	48.9us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember
Goodwill [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Identifiable assets at year end	$ 276.1us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember	$ 187.9us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember	$ 149.0us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_GoodwillMember

X

- 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.

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X

- 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.

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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.

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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.

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