XML 24 R50.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (Bachman Group Companies [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2014
--- | ---
Bachman Group Companies [Member] |
Business Acquisition [Line Items] |
Cash acquired | $ 2.0

X
- Definition Business Acquisition Purchase Price Allocation Cash Acquired + References No definition available. + Details
Name: | iosp_BusinessAcquisitionPurchasePriceAllocationCashAcquired
Namespace Prefix: | iosp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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