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Subsequent Events - Additional Information (Detail) (Independence Oilfield Chemicals LLC [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Oct. 27, 2014 Subsequent Event [Member] | Oct. 27, 2014 Subsequent Event [Member]
Subsequent Event [Line Items] |  |  |
Date of acquisition | Oct. 27, 2014 |  |
Acquired membership interests |  |  | 100.00%
Business acquisition, consideration |  | $ 212.8 |
Business acquisition, initial payment |  | $ 99.0 |
Business acquisition, description |  | Innospec will make two deferred consideration payments, with the first one payable approximately one year after closing, and the second one payable approximately two years after closing, with a portion of such deferred payments payable, at Innospec's election, in shares of Innospec's common stock. |

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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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