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Income Taxes - Factors Effecting Effective Tax Rate from U.S. Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Foreign income inclusions	5.50%iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationForeignIncomeInclusions	4.20%iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationForeignIncomeInclusions	10.50%iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationForeignIncomeInclusions
Foreign tax rate differential	(14.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(14.60%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	(16.40%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax charge/(credit) from previous years	4.70%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(2.90%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits	(0.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Net charge/(credit) from unrecognized tax benefits	(6.20%)iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationNetChargeCreditFromUnrecognizedTaxBenefit	0.20%iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationNetChargeCreditFromUnrecognizedTaxBenefit	0.30%iosp_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationNetChargeCreditFromUnrecognizedTaxBenefit
Foreign currency translation	1.00%iosp_EffectiveIncomeTaxRateReconciliationForeignExchangeRatePercent	(2.70%)iosp_EffectiveIncomeTaxRateReconciliationForeignExchangeRatePercent	(1.00%)iosp_EffectiveIncomeTaxRateReconciliationForeignExchangeRatePercent
Other items and adjustments, net	(1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.50%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective Income Tax Rate	24.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	16.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations	28.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Foreign Income Inclusions

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Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Net Charge Credit From Unrecognized Tax Benefit

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Effective Income Tax Rate Reconciliation Foreign Exchange Rate Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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-Name Accounting Standards Codification

-Topic 235

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-Section S99

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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