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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) (Stock Equivalent Units [Member], USD $) | 3 Months Ended
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Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Outstanding, Number of Options, Beginning balance | 286,563 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingNumber
Exercised, Number of Options | (81,695)iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercised
Forfeited, Number of Options | (1,495)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Outstanding, Number of Options, Ending balance | 278,989 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingNumber
Outstanding, Weighted Average Exercise Price, Beginning balance | $ 3.41 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
Exercised, Weighted Average Exercise Price | $ 2.31 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice
Forfeited, Weighted Average Exercise Price | $ 29.56 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageExercisePrice
Outstanding, Weighted Average Exercise Price, Ending balance | $ 3.67 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice
Discount [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted, Number of Options | 69,280 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_DiscountMember
Granted, Weighted Average Exercise Price | $ 0.00 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_DiscountMember
Granted, Weighted Average Grant-Date Fair Value | $ 36.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_DiscountMember
Market Value [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Granted, Number of Options | 6,336 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_MarketValueMember
Granted, Weighted Average Exercise Price | $ 43.95 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_MarketValueMember
Granted, Weighted Average Grant-Date Fair Value | $ 9.89 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember / us-gaap_StatementScenarioAxis = iosp_MarketValueMember

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options exercised. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options exercised in period weighted average exercise price. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options forfeited in period weighted average exercise price. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period weighted average exercise price. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding number. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:sharesItemType
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding weighted average exercise price. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | duration

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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