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Share Based Compensation Plans (Details Textual) (USD $)
 1 Months Ended 12 Months Ended
Feb. 28, 2009
Dec. 31, 2012
Stock_Plan
Directors
Executives
Employee
Dec. 31, 2011
Dec. 31, 2010
Share Based Compensation Plans (Textual) [Abstract]        
Expiration term for stock options granted   10 years    
Cash received from the exercise of stock option awards   $ 1,200,000 $ 700,000 $ 200,000
Total options vested   374,384 290,363 174,298
Share Based Compensation Plans (Additional Textual) [Abstract]        
Number of shares issued   29,554,500 29,554,500  
Number of shares of common stock authorized   40,000,000 40,000,000  
Treasury stock, shares   6,222,076 6,507,081  
LTIP [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
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 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    
Stock Options [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
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    
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    
Number Exercisable and Fully Vested   172,122    
Fully vested stock options with performance conditions attached   95,724    
Total compensation cost of SEUs   3,100,000 3,100,000 3,100,000
Cash tax benefit realized from stock option exercises   2,700,000 1,700,000 500,000
Excess tax benefit   2,200,000 1,100,000 0
Total compensation cost related to non-vested stock options not yet recognized   2,800,000    
Expected compensation cost recognized over the weighted average period   1 year 3 months 22 days    
Stock options award modified   0 0 0
Number of extended vesting period grants, under key employee performance related stock option plan 132,470      
Additional compensation cost of modified stock options 200,000      
Total intrinsic value of options exercised   1,500,000 2,200,000 3,700,000
Cash received from the exercise of stock option awards   1,200,000 700,000 200,000
Total fair value of stock option vested   1,300,000 2,900,000 4,400,000
Stock Equivalent Units [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
Expiration term for stock options granted   10 years    
Aggregate intrinsic value of fully vested SEUs   400,000    
Number of exercisable SEUs   94,210    
Fully vested stock options with performance conditions attached   70,399    
Total compensation cost of SEUs   6,800,000 5,900,000 5,200,000
Expected compensation cost recognized over the weighted average period   10 months 6 days    
Total intrinsic value of options exercised   1,300,000 400,000 400,000
Amount of cash received from the exercise of SEUs awards   400,000 0 0
Total fair value of stock option vested   $ 500,000 $ 0 $ 0
Total options vested   436,914 19,000 600
Minimum [Member] | Stock Options [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
Range of stock vesting period   24 months    
Minimum [Member] | Stock Equivalent Units [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
Range of stock vesting period   11 months    
Maximum [Member] | Stock Options [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
Range of stock vesting period   6 years    
Maximum [Member] | Stock Equivalent Units [Member]
        
Share Based Compensation Plans (Textual) [Abstract]        
Range of stock vesting period   4 years