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Stockholders' Equity and Share Based Compensation Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 Directors Employee Executives Stock_Plan | Jun. 30, 2011 | Dec. 31, 2011
Stockholders Equity And Share Based Compensation Plans (Textual) [Abstract] |  |  |
Number of shares of common stock authorized | 40,000,000 |  | 40,000,000
Number of shares issued | 29,554,500 |  | 29,554,500
Treasury stock, shares | 6,339,772 |  | 6,507,081
Number of active stock option plans | 5 |  |
Number of active stock option plans for employees | 2 |  |
Number of active stock option plans for non-employee directors | 1 |  |
Number of active stock option plans for key executives | 1 |  |
Expiration term for stock options granted | 10 years |  |
Aggregate number of shares of common stock reserved for issuance which can be granted | 2,640,000 |  |
Aggregate intrinsic value of fully vested stock options | $ 0.7 |  |
Fully vested stock options | 150,310 |  |
Fully vested stock options with performance conditions attached | 59,009 |  |
Total compensation cost | 1.6 | 1.6 |
Total compensation cost related to non-vested stock options not yet recognized | 3.9 |  |
Expected compensation cost recognized over the weighted average period | 1 year 7 months 17 days |  |
Total intrinsic value of options exercised | 0.6 | 2.1 |
Cash received from the exercise of stock option awards | 0.7 | 0.7 |
Total fair value of shares vested | 0.7 | 2.9 |
Total options vested | 242,880 | 290,363 |
Minimum out-performance of Innospec share price versus Russell 2000 Index for long-term incentive plan to be payable | 10.00% |  |
Long-term incentive plan term | 5 years |  |
Out-performance of Innospec share price versus Russell 2000 Index for maximum bonus under long-term incentive plan | 30.00% |  |
Maximum bonus under long term incentive plan | $ 8 | $ 8 |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock options vesting period | 6 years |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of stock options vesting period | 24 months |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(c), d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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