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Stockholders' Equity and Stock-Based Compensation Plans - Fair Value of Liability Cash-Settled Stock Appreciation Rights (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Balance at January 1	$ 0
Compensation charge for the period	0.1
Balance at March 31	$ 0.1

X

- Definition

Change in fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of liability cash-settled stock appreciation rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Details

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