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Pension Plans (Details Textual) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 USD ($) | Dec. 31, 2011 GBP (£)
Pension Plans (Textual) [Abstract] |  |  |
Annual cash contribution |  | $ 9.0 | £ 5.8
Cash contribution plan period | 10 years |  |

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- Definition Actuarial deficit recovery plan period. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | iosp_
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Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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Balance Type: | debit
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