XML 34 R87.htm IDEA: XBRL DOCUMENT v2.4.1.9

Plant Closure Provisions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]
Expenditure	$ 2.0us-gaap_PaymentsForRestructuring	$ 2.0us-gaap_PaymentsForRestructuring	$ 2.7us-gaap_PaymentsForRestructuring
Severance [Member]
Restructuring Cost and Reserve [Line Items]
Number of reporting segments	3us-gaap_NumberOfReportableSegments / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Expenditure	0us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	0.1us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	0.6us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Remediation [Member]
Restructuring Cost and Reserve [Line Items]
Accretion expense recognized	2.8us-gaap_AssetRetirementObligationAccretionExpense / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember
Remediation charge for changes in the scope and cost of future remediation activities	2.2us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember
Discount rate of remediation provision	8.92%us-gaap_AccrualForEnvironmentalLossContingenciesDiscountRate / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember
Expenditure	$ 2.0us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember	$ 1.9us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember	$ 2.1us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = iosp_RemediationMember

X

- Definition

Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q1)

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-Number Topic 5

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ 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

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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