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Segment Reporting and Geographical Area Data - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Jun. 30, 2016 Segment | Dec. 31, 2016 Customer | Dec. 31, 2015 Customer | Dec. 31, 2014 Customer
Segment Reporting [Abstract] |  |  |  |
Number of reportable segments | Segment | 4 |  |  |
Number of significant customers with sales greater than 10% | Customer |  | 0 | 0 | 0

X
- Definition Number of customers representing greater than ten percent of net sales. + References No definition available. + Details
Name: | iosp_NumberOfCustomersRepresentingGreaterThanTenPercentOfNetSales
Namespace Prefix: | iosp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration