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Goodwill - Schedule of Consolidated Income Statement Included Revenue and Earnings (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Net sales	$ 960.9us-gaap_SalesRevenueNet	$ 818.8us-gaap_SalesRevenueNet	$ 776.4us-gaap_SalesRevenueNet
Net income	84.1us-gaap_NetIncomeLoss	77.8us-gaap_NetIncomeLoss	66.9us-gaap_NetIncomeLoss
Independence Acquisition [Member]
Business Acquisition [Line Items]
Net sales	35.0us-gaap_SalesRevenueNet / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember
Net income	$ 0.2us-gaap_NetIncomeLoss / us-gaap_BusinessAcquisitionAxis = iosp_IndependenceOilfieldChemicalsLLCMember

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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