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Pension Plans - Unfunded Defined Benefit Pension Plan (Detail) (German Plan [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
German Plan [Member] |  |  |
German plan net pension charge: |  |  |
Service cost | $ 0.2 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | $ 0.2 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | $ 0.1 us-gaap_DefinedBenefitPlanServiceCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Interest cost on PBO | 0.3 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 0.3 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 0.3 us-gaap_DefinedBenefitPlanInterestCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Amortization of prior service cost/(credit) | 0 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_PlanNameAxis = iosp_GermanPlanMember | (0.1)us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Amortization of actuarial net loss/(gain) | 0.1 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 0.2 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 0 us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Net pension charge | $ 0.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | $ 0.6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember | $ 0.4 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = iosp_GermanPlanMember
German plan assumptions at December 31, (%): |  |  |
Discount rate | 2.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 3.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 3.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Inflation rate | 1.75%iosp_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInflationRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 2.00%iosp_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInflationRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 2.00%iosp_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInflationRate / us-gaap_PlanNameAxis = iosp_GermanPlanMember
Rate of increase in compensation levels | 2.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 2.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_PlanNameAxis = iosp_GermanPlanMember | 2.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / us-gaap_PlanNameAxis = iosp_GermanPlanMember

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- Definition Defined benefit plan assumptions used calculating net periodic benefit cost inflation rate. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Balance Type: | debit
Period Type: | duration

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- Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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