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Subsequent Events (Details) (TPC Group, Inc [Member], USD $)	Oct. 05, 2012
Minimum [Member]
Subsequent Events (Textual) [Abstract]
Common stock cash price per share	$ 44
Maximum [Member]
Subsequent Events (Textual) [Abstract]
Common stock cash price per share	$ 46

X

- Details

Name:	iosp_SubsequentEventsTextualAbstract
Namespace Prefix:	iosp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Price-per-share of common or preferred stock issued or sold by the subsidiary or equity method investee.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section H

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant