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Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended									12 Months Ended				12 Months Ended								12 Months Ended							12 Months Ended		12 Months Ended		12 Months Ended				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Brand Names [Member]	Dec. 31, 2012 Brand Names [Member]	Dec. 31, 2013 Technology [Member]	Dec. 31, 2012 Technology [Member]	Dec. 31, 2013 Customer Relationships [Member]	Dec. 31, 2012 Customer Relationships [Member]	Dec. 31, 2013 Customer Lists [Member]	Dec. 31, 2013 Patents [Member]	Dec. 31, 2012 Patents [Member]	Dec. 31, 2013 Internally Developed Software and Other Costs [Member]	Dec. 31, 2012 Internally Developed Software and Other Costs [Member]	Dec. 31, 2013 Internally Developed Software and Other Costs [Member] Selling, General and Administrative Expenses [Member]	Dec. 31, 2012 Internally Developed Software and Other Costs [Member] Selling, General and Administrative Expenses [Member]	Dec. 31, 2013 Non-Compete Agreements [Member]	Dec. 31, 2012 Non-Compete Agreements [Member]	Dec. 31, 2013 Non-Compete Agreements [Member] Selling, General and Administrative Expenses [Member]	Dec. 31, 2012 Non-Compete Agreements [Member] Selling, General and Administrative Expenses [Member]	Dec. 31, 2013 Marketing Related [Member]	Dec. 31, 2012 Marketing Related [Member]	Dec. 31, 2008 Marketing Related [Member]	Jun. 30, 2007 Marketing Related [Member]	Dec. 31, 2013 Product Rights [Member]	Dec. 31, 2012 Product Rights [Member]	Dec. 31, 2013 Innospec Fuel Specialties LLC [Member]	Dec. 31, 2013 Innospec Fuel Specialties LLC [Member] Technology [Member]	Dec. 31, 2013 Innospec Widnes Limited [Member]	Dec. 31, 2013 Innospec Widnes Limited [Member] Technology [Member]	Dec. 31, 2013 Bachman [Member] Brand Names [Member]	Dec. 31, 2012 Bachman [Member] Brand Names [Member]	Nov. 04, 2013 Bachman [Member] Brand Names [Member]	Dec. 31, 2013 Bachman [Member] Technology [Member]	Nov. 04, 2013 Bachman [Member] Technology [Member]	Dec. 31, 2013 Bachman [Member] Customer Relationships [Member]	Nov. 04, 2013 Bachman [Member] Customer Relationships [Member]	Dec. 31, 2013 Strata [Member] Technology [Member]	Dec. 31, 2013 Strata [Member] Customer Relationships [Member]	Dec. 31, 2013 Finetex [Member]	Dec. 31, 2013 Finetex [Member] Patents [Member]	Dec. 31, 2013 Chemsil [Member] Product Rights [Member]	Dec. 31, 2012 Chemsil [Member] Product Rights [Member]	Aug. 30, 2013 Chemsil [Member] Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Allocation of purchase price to other intangible assets																																	$ 2.9		$ 8.5		$ 14.5							$ 34.0
Assets being amortized duration	10 years									13 years	10 years		5 years				2 years											10 years		10 years	5 years			15 years		14 years 6 months		16 years 6 months	11 years 6 months			9 years
Amortization expense	11.1	4.1	4.4			1.9	0.7	4.1	1.5		0.3	0.3			1.0	0			0.7	0	1.7	1.6									0.1	0										1.3	0
Date of acquisition																												Jul. 08, 2004			Nov. 04, 2013			Nov. 04, 2013		Nov. 04, 2013		Dec. 24, 2012	Nov. 04, 2013			Aug. 30, 2013
Residual value																															0			0		0						0
Intangible assets, recognized										4.2							1.5										9.0	2.3	2.8	4.8								18.3	28.2	7.1
Percent of remaining interest of entity acquired						50.00%
Intangible asset	175.5	106.2		2.9	0	33.9	25.4	58.7	44.2		2.9	2.9	19.5	10.1			1.5	1.5			22.1	22.1		28.4	34.0	0															2.9
Contract provisions offset against intangible assets																							6.3
Cost of goods, amortization	$ 3.8	$ 2.6	$ 2.9

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Contract Provisions Offset Against Intangible Assets

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Percent Of Remaining Interest Of Entity Acquired

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The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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The amount of expense recognized in the current period that reflects the allocation of the costs of intangible assets over the expected benefit period of such assets. This element applies only to intangible assets used in the production of goods.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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