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Acquisitions - Summary of Pro Forma Financial Information (Detail) - Bayer Material Science [Member] $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2013 USD ($) $ / shares
Business Acquisition Pro Forma Information [Line Items] |
Net Sales | $ | $ 1,907,607
Net Income Attributable to Stepan Company | $ | $ 73,609
Net Income Per Common Share Attributable to Stepan Company: |
Basic | $ / shares | $ 3.25
Diluted | $ / shares | $ 3.21

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