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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2011
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Unrecognized tax benefits, interest and penalties | $ 6,200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  | $ 6,200,000 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Cash payments for income taxes | 11,600,000 us-gaap_IncomeTaxesPaid | 21,100,000 us-gaap_IncomeTaxesPaid | 13,100,000 us-gaap_IncomeTaxesPaid |  |  |  |
Operating loss carry forwards | 600,000 us-gaap_OperatingLossCarryforwards | 300,000 us-gaap_OperatingLossCarryforwards |  | 600,000 us-gaap_OperatingLossCarryforwards |  |  |
Operating loss carry forwards valuation allowance | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |  | 0 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |  |
Foreign tax credit carry forwards | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance | 0 us-gaap_DeferredTaxAssetsValuationAllowance |  |  | 7,500,000 us-gaap_DeferredTaxAssetsValuationAllowance
Unremitted earnings | 743,000,000 iosp_UnremittedEarningOfForeignSubsidiary | 605,000,000 iosp_UnremittedEarningOfForeignSubsidiary |  |  |  |  |
Foreign Income [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Foreign tax credit carry forwards | 800,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = iosp_ForeignIncomeMember | 4,500,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = iosp_ForeignIncomeMember |  | 800,000 us-gaap_DeferredTaxAssetsValuationAllowance / us-gaap_TaxCreditCarryforwardAxis = iosp_ForeignIncomeMember |  |  |
Unrecognized Tax Benefits [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reduction in unrecognized tax benefits |  |  |  |  | 2,900,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = iosp_UnrecognizedTaxBenefitsMember | 3,600,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = iosp_UnrecognizedTaxBenefitsMember |
Unrecognized tax benefits |  |  |  | 300,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = iosp_UnrecognizedTaxBenefitsMember |  |  |
Interest and Penalties [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Reduction in unrecognized tax benefits |  |  |  |  | $ 200,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = iosp_InterestAndPenaltiesMember | $ 400,000 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions / us-gaap_ReasonablyPossibleSignificantChangeInUnrecognizedTaxBenefitsByItemAxis = iosp_InterestAndPenaltiesMember |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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