XML 37 R56.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Unrecognized Tax Benefits [Member] | Sep. 30, 2014 Unrecognized Tax Benefits [Member] | Mar. 31, 2014 Interest and Penalties [Member] | Sep. 30, 2014 Interest and Penalties [Member]
Income Tax Contingency [Line Items] |  |  |  |  |  |
Reductions for tax positions of prior periods | $ 4.0 |  | $ 3.6 | $ 3.6 | $ 0.4 | $ 0.4
Income tax examination, description | The Company and its U.S. subsidiaries remain open to examination by the IRS for years 2011 onwards. The Company’s subsidiaries in foreign tax jurisdictions are open to examination including France (2012 onwards), Germany (2010 onwards), Switzerland (2012 onwards) and the United Kingdom (2012 onwards). |  |  |  |  |
Unremitted earnings |  | $ 605 |  |  |  |

X
- Definition Unremitted earning of foreign subsidiary. + References No definition available. + Details
Name: | iosp_UnremittedEarningOfForeignSubsidiary
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
Name: | us-gaap_IncomeTaxExaminationDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration