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Goodwill - Purchase Price and Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) (Bachman Group Companies [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 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