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Subsequent Events (Details) (TPC Group, Inc [Member], USD $) | Oct. 05, 2012
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Minimum [Member] |
Subsequent Events (Textual) [Abstract] |
Common stock cash price per share | $ 44
Maximum [Member] |
Subsequent Events (Textual) [Abstract] |
Common stock cash price per share | $ 46

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

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- Definition Price-per-share of common or preferred stock issued or sold by the subsidiary or equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant