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Goodwill - Summary of Goodwill (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fuel Specialties [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 8.7iosp_GoodwillHistoricalAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = iosp_FuelSpecialtiesMember
Performance Chemicals [Member]
Goodwill [Line Items]
Historical accumulated amortization		0.3iosp_GoodwillHistoricalAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = iosp_PerformanceChemicalsMember
Octane Additives [Member]
Goodwill [Line Items]
Historical accumulated amortization			$ 289.5iosp_GoodwillHistoricalAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = iosp_OctaneAdditivesMember

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- Definition

Goodwill historical accumulated amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=iosp_FuelSpecialtiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=iosp_OctaneAdditivesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=iosp_PerformanceChemicalsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: