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Stockholders' Equity and Stock-Based Compensation Plans - Fair Value of Liability Cash-Settled Stock Appreciation Rights (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Balance at January 1 | $ 0
Compensation charge for the period | 0.1
Balance at June 30 | $ 0.1

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- Definition Change in fair value of liability cash-settled stock appreciation rights. + References No definition available. + Details
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Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value of liability cash-settled stock appreciation rights. + References No definition available. + Details
Name: | iosp_FairValueOfLiabilityCashSettledStockAppreciationRights
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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