XML 74 R63.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stockholders' Equity and Stock-Based Compensation Plans - Fair Value of Liability Cash-Settled Stock Appreciation Rights (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Balance at January 1 | $ 0
Compensation charge for the period | 0.1
Balance at March 31 | $ 0.1

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

X
- 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

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