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Stockholders' Equity and Share Based Compensation Plans (Details Textual) (USD $) | 9 Months Ended |
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Sep. 30, 2012 Directors Employee Executives Stock_Plan | Sep. 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 | 6,274,766 |  | 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 | $ 1,300,000 |  |
Fully vested stock options | 185,330 |  |
Fully vested stock options with performance conditions attached | 102,393 |  |
Total compensation cost | 2,400,000 | 2,300,000 |
Total compensation cost related to non-vested stock options not yet recognized | 3,400,000 |  |
Expected compensation cost recognized over the weighted average period | 1 year 5 months 23 days |  |
Total intrinsic value of options exercised | 1,300,000 | 2,100,000 |
Cash received from the exercise of stock option awards | 800,000 | 700,000 |
Total fair value of shares vested | 1,300,000 | 2,900,000 |
Total options vested | 342,880 | 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 | 8,000,000 | 8,000,000 |
Long-term incentive plan bonus condition term | No bonus is payable under this plan if the Innospec stock price does not out-perform the Russell 2000 Index by more than 10% over the five year period, or the Russell 2000 Index falls in value over the same period. |  |
Long-term incentive plan bonus condition amount | $ 0 |  |
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 The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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