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Goodwill - Summary of Goodwill (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fuel Specialties [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 8.7	$ 0.3	$ 289.5
Performance Chemicals [Member]
Goodwill [Line Items]
Historical accumulated amortization	8.7	0.3	289.5
Octane Additives [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 8.7	$ 0.3	$ 289.5

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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
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=iosp_PerformanceChemicalsMember
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Balance Type:
Period Type:

X

- Details

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