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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 31, 2014 | Aug. 28, 2013 | Dec. 14, 2011 | Sep. 13, 2011 Installment
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, drawn down amount | $ 30,000,000 us-gaap_ProceedsFromLinesOfCredit | $ 53,000,000 us-gaap_ProceedsFromLinesOfCredit | $ 145,000,000 us-gaap_ProceedsFromLinesOfCredit | $ 18,000,000 us-gaap_ProceedsFromLinesOfCredit |  |  |  |
Maximum ratio of net debt to EBITDA |  | 2.5 iosp_MaximumDebtToEarningBeforeInterestTaxDepreciationAndAmortizationRatio |  |  |  |  |  |
Minimum ratio of EBITDA to net interest |  | 4.0 iosp_MinimumEarningBeforeInterestTaxDepreciationAndAmortizationToInterestRatio |  |  |  |  |  |
Weighted average rate of interest on borrowings | 1.60%us-gaap_LongtermDebtWeightedAverageInterestRate | 1.70%us-gaap_LongtermDebtWeightedAverageInterestRate | 1.60%us-gaap_LongtermDebtWeightedAverageInterestRate |  |  |  |  |
Payments of interest on long-term debt |  | 2,300,000 us-gaap_InterestExpenseDebt | 1,000,000 us-gaap_InterestExpenseDebt | 500,000 us-gaap_InterestExpenseDebt |  |  |  |
Net cash outflows in respect of refinancing costs |  | 100,000 us-gaap_PaymentsOfDebtIssuanceCosts | 900,000 us-gaap_PaymentsOfDebtIssuanceCosts | 0 us-gaap_PaymentsOfDebtIssuanceCosts |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility term |  |  |  |  |  |  | 5 years |
Credit facility maximum borrowing capacity |  |  |  |  | 200,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember | 100,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |
Expiration date of facility |  | Dec. 14, 2016 |  |  |  | Dec. 31, 2016 | Dec. 14, 2016 |
Credit facility, borrowings capacity increased amount |  |  |  |  | 20,000,000 us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |  |
Revolving Credit Facility [Member] | Amended Credit Facility [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility term |  |  |  |  |  | 5 years |  |
Credit facility maximum borrowing capacity |  |  |  |  |  | 150,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = iosp_AmendedRevolvingFacilityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember |  |
Previous Finance Facility [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Expiration date of facility |  |  |  |  |  |  | Feb. 06, 2012 |
Additional Amount to be Committed by Lenders [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility, drawn down amount |  |  |  |  |  | 50,000,000 us-gaap_ProceedsFromLinesOfCredit / us-gaap_LongtermDebtTypeAxis = iosp_AdditionalAmountToBeCommittedByLendersMember |  |
Promissory Note [Member] | NewMarket Corporation [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Promissory note issued |  |  |  |  |  |  |  | $ 15,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = iosp_PromissoryNoteMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = iosp_NewMarketCorporationMember
Carrying simple interest per annum |  |  |  |  |  |  |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = iosp_PromissoryNoteMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = iosp_NewMarketCorporationMember
Number of repayment installments |  |  |  |  |  |  |  | 3 iosp_NumberOfRepaymentInstallment / us-gaap_LongtermDebtTypeAxis = iosp_PromissoryNoteMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = iosp_NewMarketCorporationMember
Minimum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Margin rate based on U.S. dollar LIBOR |  |  |  |  |  |  | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Schedule Of Debt Instruments [Line Items] |  |  |  |  |  |  |  |
Margin rate based on U.S. dollar LIBOR |  |  |  |  |  |  | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LongtermDebtTypeAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

X
- Definition Maximum Debt To Earning Before Interest Tax Depreciation And Amortization Ratio + References No definition available. + Details
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- Definition Minimum Earning Before Interest Tax Depreciation And Amortization To Interest Ratio + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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