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Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2008	Jun. 30, 2007	Aug. 30, 2013	Oct. 27, 2014	Nov. 04, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 17,800,000us-gaap_AmortizationOfIntangibleAssets	$ 11,100,000us-gaap_AmortizationOfIntangibleAssets	$ 4,100,000us-gaap_AmortizationOfIntangibleAssets
Intangible asset	247,600,000us-gaap_FiniteLivedIntangibleAssetsGross	175,500,000us-gaap_FiniteLivedIntangibleAssetsGross
Cost of goods, amortization	7,400,000us-gaap_CostOfGoodsSoldAmortization	3,800,000us-gaap_CostOfGoodsSoldAmortization	2,600,000us-gaap_CostOfGoodsSoldAmortization
Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset	34,000,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember	34,000,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember
Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	700,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember	100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Intangible asset	8,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember	2,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	2,400,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember	1,900,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Intangible asset	59,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember	33,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	5,000,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	4,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible asset	87,900,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember	58,700,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Internally Developed Software and Other Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Assets being amortized duration	5 years
Intangible asset	27,800,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_InternallyDevelopedSoftwareAndOtherCostsMember	19,500,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_InternallyDevelopedSoftwareAndOtherCostsMember
Internally Developed Software and Other Costs [Member] | Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	3,800,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_InternallyDevelopedSoftwareAndOtherCostsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	1,000,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_InternallyDevelopedSoftwareAndOtherCostsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Assets being amortized duration	2 years
Intangible assets, recognized	1,500,000us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Intangible asset	4,100,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember	1,500,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Non-Compete Agreements [Member] | Selling, General and Administrative Expenses [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	900,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember	700,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember
Marketing Related [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	1,000,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember	1,700,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember
Intangible asset	22,100,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember	22,100,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember			28,400,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember
Contract provisions offset against intangible assets				6,300,000iosp_ContractProvisionsOffsetAgainstIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_MarketingRelatedIntangibleAssetsMember
Chemsil [Member] | Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets						34,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember
Assets being amortized duration	9 years
Amortization expense	3,700,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember	1,300,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember
Date of acquisition	Aug. 30, 2013
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_ChemsilMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_ProductRightsMember
Independence Acquisition [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets	63,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember
Date of acquisition	Oct. 27, 2014
Independence Acquisition [Member] | Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets							6,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Assets being amortized duration	10 years
Date of acquisition	Oct. 27, 2014
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Independence Acquisition [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets							26,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Assets being amortized duration	15 years
Date of acquisition	Oct. 27, 2014
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Independence Acquisition [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets							29,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Assets being amortized duration	10 years
Date of acquisition	Oct. 27, 2014
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Independence Acquisition [Member] | Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets							2,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember
Assets being amortized duration	3 years
Bachman [Member] | Brand Names [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets								2,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Assets being amortized duration	5 years
Date of acquisition	Nov. 04, 2013
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_BrandNamesMember
Bachman [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets								8,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Assets being amortized duration	15 years
Date of acquisition	Nov. 04, 2013
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Bachman [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets								14,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Assets being amortized duration	14 years 6 months
Date of acquisition	Nov. 04, 2013
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_BachmanGroupCompaniesAcquisitionMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Strata [Member] | Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Assets being amortized duration	16 years 6 months
Date of acquisition	Dec. 24, 2012
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_StrataControlServicesIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Intangible assets, recognized	18,300,000us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iosp_StrataControlServicesIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = iosp_TechnologyMember
Strata [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Assets being amortized duration	11 years 6 months
Date of acquisition	Dec. 24, 2012
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_StrataControlServicesIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Intangible assets, recognized	28,200,000us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iosp_StrataControlServicesIncMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Finetex [Member] | Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Assets being amortized duration	13 years
Residual value	0us-gaap_AcquiredFiniteLivedIntangibleAssetResidualValue / us-gaap_BusinessAcquisitionAxis = iosp_FinetexMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember
Intangible assets, recognized	$ 4,200,000us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = iosp_FinetexMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerListsMember

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Contract Provisions Offset Against Intangible Assets

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The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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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.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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