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

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- Definition Amount reclassified from internally developed software and other costs to property plant and equipment. + References No definition available. + Details
Name: | iosp_AmountReclassifiedFromInternallyDevelopedSoftwareAndOtherCostsToPropertyPlantAndEquipment
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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