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v2.4.1.9

Goodwill - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 27, 2014 | Oct. 26, 2016 | Oct. 26, 2015
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 276,100,000 us-gaap_Goodwill | $ 187,900,000 us-gaap_Goodwill | $ 149,000,000 us-gaap_Goodwill |  |  |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss | 1,300,000 us-gaap_GoodwillImpairmentLoss | 1,200,000 us-gaap_GoodwillImpairmentLoss |  |  |
Deferred consideration payments | 49,500,000 us-gaap_BusinessCombinationContingentConsiderationLiability | 4,600,000 us-gaap_BusinessCombinationContingentConsiderationLiability |  |  |  |
Fuel Specialties [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 229,400,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 141,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 117,600,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |  |  |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |  |  |  |
Performance Chemicals [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 46,700,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 46,800,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 30,100,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |  |  |
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember |  |  |  |
Independence Acquisition [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 88,100,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember |  |  |  |  |
Date of acquisition | Oct. 27, 2014 |  |  |  |  |
Acquired membership interests |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember |  |
Business acquisition, consideration |  |  |  | 191,800,000 iosp_BusinessAcquisitionNetConsiderationAtFairValue / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember |  |
Business acquisition, initial payment |  |  |  | 99,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember |  |
Business combination, contingent consideration arrangements, basis for amount | As Independence has been in a phase of very rapid growth, the remaining payments are performance related and contingently payable over the next two years based on a multiple of Independence’s annualized earnings before interest, taxes, depreciation and amortization plus a percentage of free cash flow. |  |  |  |  |
Business acquisition, description | Based on the current forecasts for Independence's performance, Innospec will make two deferred consideration payments, with the first one being $45.7 million payable approximately one year after closing, and the second one being $49.5 million payable approximately two years after closing, with a portion of such deferred payments payable, at Innospec's election, in shares of Innospec's common stock. |  |  |  |  |
Accretion charge | 2,400,000 us-gaap_AccretionExpense / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember |  |  |  |  |
Independence Acquisition [Member] | Forecast [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Deferred consideration payments |  |  |  |  | 49,500,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember | 45,700,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Independence Acquisition [Member] | Fuel Specialties [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill amortizable for tax purposes | $ 0 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember |  |  |  |  |

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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of the basis for determining the amount of the payment recorded. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents a description of such arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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