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Purchase of the Remaining Interest in Stepan Philippines Inc (Details) (USD $)
9 Months Ended
Sep. 30, 2012
Mar. 22, 2012
Purchase of the Remaining Interest in Stepan Philippines Inc (Textual) [Abstract]    
Percentage of company's ownership, before purchasing the interest in Stepan Philippines   88.80%
Percentage of company's ownership, after purchasing the interest in Stepan Philippines 100.00%  
Payment to noncontrolling interest $ 2,000,000  
Increase in additional paid in capital 551,000  
Reclassification of cumulative translation adjustments (gains) to AOCI $ 197,000