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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (Bachman Group Companies [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2014
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Bachman Group Companies [Member] |
Business Acquisition [Line Items] |
Cash acquired | $ 2.0

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- Definition Business Acquisition Purchase Price Allocation Cash Acquired + References No definition available. + Details
Name: | iosp_BusinessAcquisitionPurchasePriceAllocationCashAcquired
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration