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Goodwill - Summary of Goodwill (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Fuel Specialties [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 8.7
Performance Chemicals [Member]
Goodwill [Line Items]
Historical accumulated amortization	0.3
Octane Additives [Member]
Goodwill [Line Items]
Historical accumulated amortization	$ 289.5

X

- Definition

Goodwill historical accumulated amortization.

+ References

No definition available.

+ Details

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

X

- Details

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