XML 111 R95.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Stock-Based Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 Stock_Plan Executives Directors | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Accrued liabilities | $ 77.2 us-gaap_AccruedLiabilitiesCurrent | $ 73.5 us-gaap_AccruedLiabilitiesCurrent |
Maximum cash bonus under long-term incentive plan | 3 iosp_LongTermIncentivePlanMaximumBonus |  |
Stock Options Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of active stock option plans | 5 iosp_NumberOfActiveStockOptionPlans / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Number of active stock option plans for employees | 2 iosp_NumberOfActiveStockOptionPlansForEmployees / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Number of active stock option plans for non-employee directors | 1 iosp_NumberOfActiveStockOptionPlansForNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Number of active stock option plans for key executives | 1 iosp_NumberOfActiveStockOptionPlansForKeyExecutives / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Expiration term for stock granted | 10 years |  |
Aggregate number of shares of common stock reserved for issuance which can be granted | 2,640,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Number exercisable and fully vested | 51,001 us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Fully vested stock options with performance conditions attached | 134,921 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberPerformanceConditionsAttached / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Stock option compensation cost of SEUs | 2.6 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2.5 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 3.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Total intrinsic value of options exercised | 0.9 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 4.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 1.5 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Total compensation cost related to non-vested stock options not yet recognized | 4.7 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember |  |
Expected compensation cost recognized over the weighted-average period | 2 years 3 months 18 days |  |
Cash tax benefit realized from stock option exercises | 0.9 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 5.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2.7 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Excess tax benefit | 0.4 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 3.8 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2.2 us-gaap_DeferredTaxExpenseFromStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Stock Options awards modified | 0 iosp_NumberOfStockOptionsModified / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0 iosp_NumberOfStockOptionsModified / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0 iosp_NumberOfStockOptionsModified / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Stock Options Plan [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 24 months |  |
Stock Options Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 6 years |  |
Stock Equivalent Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration term for stock granted | 10 years |  |
Fully vested stock options with performance conditions attached | 91,226 iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberPerformanceConditionsAttached / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember |  |
Stock option compensation cost of SEUs | 2.0 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember | 7.1 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember | 6.8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember
Total intrinsic value of options exercised | 3.7 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember | 2.2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember | 1.3 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember
Expected compensation cost recognized over the weighted-average period | 1 year 2 months 1 day |  |
Accrued liabilities | $ 7.2 us-gaap_AccruedLiabilitiesCurrent / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember |  |
Number of exercisable SEUs | 79,868 iosp_ShareBasedCompensationSharesAuthorizedUnderStockEquivalentUnitsExercisePriceRangeNumberOfExercisableOptions / us-gaap_AwardTypeAxis = iosp_StockEquivalentUnitsMember |  |
Stock Equivalent Units [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 11 months |  |
Stock Equivalent Units [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock vesting period | 4 years |  |

X
- Definition Maximum bonus under long term incentive plan. + References No definition available. + Details
Name: | iosp_LongTermIncentivePlanMaximumBonus
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of active stock option plans. + References No definition available. + Details
Name: | iosp_NumberOfActiveStockOptionPlans
Namespace Prefix: | iosp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of active stock option plans for employees. + References No definition available. + Details
Name: | iosp_NumberOfActiveStockOptionPlansForEmployees
Namespace Prefix: | iosp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of active stock option plans for key executives. + References No definition available. + Details
Name: | iosp_NumberOfActiveStockOptionPlansForKeyExecutives
Namespace Prefix: | iosp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of active stock option plans for non-employee directors. + References No definition available. + Details
Name: | iosp_NumberOfActiveStockOptionPlansForNonEmployeeDirectors
Namespace Prefix: | iosp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Stock Options Modified + References No definition available. + Details
Name: | iosp_NumberOfStockOptionsModified
Namespace Prefix: | iosp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share based compensation arrangement by share based payment award options exercisable number performance conditions attached. + References No definition available. + Details
Name: | iosp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumberPerformanceConditionsAttached
Namespace Prefix: | iosp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based compensation shares authorized under stock equivalent units exercise price range number of exercisable options. + References No definition available. + Details
Name: | iosp_ShareBasedCompensationSharesAuthorizedUnderStockEquivalentUnitsExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix: | iosp_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
Name: | us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
Name: | us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual 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 (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=iosp_StockEquivalentUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_StockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |