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Earnings Per Share - Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Computation of Basic Earnings per Share        
Net income attributable to Stepan Company $ 12,571 $ 39,384 $ 41,397 $ 136,319
Weighted-average number of common shares outstanding 22,786 22,753 22,770 22,813
Basic earnings per share $ 0.55 $ 1.73 $ 1.82 $ 5.98
Computation of Diluted Earnings per Share        
Net income attributable to Stepan Company $ 12,571 $ 39,384 $ 41,397 $ 136,319
Weighted-average number of common shares outstanding 22,786 22,753 22,770 22,813
Add weighted-average net shares related to unvested stock awards (under treasury stock method) 3 2 2 1
Weighted-average shares applicable to diluted earnings 22,930 23,034 22,956 23,089
Diluted earnings per share $ 0.55 $ 1.71 $ 1.8 $ 5.9
Employee Stock Option        
Computation of Diluted Earnings per Share        
Add weighted-average net shares from assumed exercise of options (under treasury stock method) [1] 54 102 75 105
Stock Appreciation Rights (SARs) [Member]        
Computation of Diluted Earnings per Share        
Add weighted-average net shares from assumed exercise of options (under treasury stock method) [1] 53 108 78 111
Performance Stock Award [Member]        
Computation of Diluted Earnings per Share        
Add weighted-average net shares from assumed exercise of options (under treasury stock method) 34 69 31 59
[1] 822,271 and 623,648 options/SARs to acquire shares of the Company's common stock were excluded from the computation of dilutive earnings per share for the three and nine months ended September 30, 2023, respectively. The options/SARs' exercise prices were greater than the average market price for the Company's common stock and inclusion of the instruments would have had an antidilutive effect on the computations of the earnings per share. 336,727 and 346,044 options/SARs to acquire shares of the Company's common stock were excluded from the computation of dilutive earnings per share for the three and nine months ended September 30, 2022, respectively.