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Stockholders' Equity and Share Based Compensation Plans (Details Textual) (USD $)
 9 Months Ended
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