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Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2013
Commitments and Contingencies [Abstract]
Schedule of expected settlement payment	Schedule of expected settlement payment

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- Definition

Schedule of expected settlement payments.

+ References

No definition available.

+ Details

Name:	iosp_ScheduleOfExpectedSettlementPaymentsTableTextBlock
Namespace Prefix:	iosp_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

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- Details

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