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Nature of Operations (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012
Nature of Operations (Textual) [Abstract]
Reclassification adjustment related to internally developed software and other costs capitalized	$ 1.6

X

- Definition

Amount reclassified from internally developed software and other costs to property plant and equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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