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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Computation of Basic Earnings per Share      
Net income attributable to Stepan Company $ 126,770 $ 103,129 $ 111,117
Weighted-average number of shares outstanding 22,949 23,054 23,022
Basic earnings per share $ 5.52 $ 4.47 $ 4.83
Computation of Diluted Earnings per Share      
Net income attributable to Stepan Company $ 126,770 $ 103,129 $ 111,117
Weighted-average number of shares outstanding 22,949 23,054 23,022
Weighted-average shares applicable to diluted earnings 23,256 23,316 23,325
Diluted earnings per share $ 5.45 $ 4.42 $ 4.76
Stock Option [Member]      
Computation of Diluted Earnings per Share      
Add weighted-average net shares from assumed exercise of options (under treasury share method) [1] 112 97 101
Unvested Stock Awards [Member]      
Computation of Diluted Earnings per Share      
Add weighted-average net shares related to unvested stock awards (under treasury share method) 1 2 3
Stock Appreciation Rights (SARs) [Member]      
Computation of Diluted Earnings per Share      
Add weighted-average net shares from assumed exercise of options (under treasury share method) 145 125 110
Performance Stock Award [Member]      
Computation of Diluted Earnings per Share      
Add weighted-average net shares from assumed exercise of options (under treasury share method) 49 38 89
[1] Options/SARs to purchase 127,434, 107,125 and 50,770 shares of common stock were excluded from the computations of diluted earnings per share for the years ended December 31, 2020, 2019 and 2018, respectively. The options’/SARs’ exercise prices were greater than the average market price for the common stock and inclusion of the instruments would have had antidilutive effect on the computations of the earnings per share.