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Goodwill - Summary of Goodwill (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fuel Specialties [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 8.7	$ 8.7	$ 8.7
Performance Chemicals [Member]
Goodwill [Line Items]
Historical accumulated amortization	0.3	0.3	0.3
Octane Additives [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 289.5	$ 289.5	$ 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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Namespace Prefix:	us-gaap_
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Period Type:	duration

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- Details

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Balance Type:
Period Type:

X

- Details

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

X

- Details

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