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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net Income $ 127,656 $ 103,101 $ 111,105
Other Comprehensive Income:      
Foreign currency translation adjustments (Note 19) (2,973) 4,425 (37,966)
Defined benefit pension plans:      
Net actuarial gain (loss) arising in period (net of tax benefit of $265, tax expense of $1,263 and tax benefit of $2,300 for 2020, 2019 and 2018, respectively) (996) 4,112 (7,080)
Amortization of prior service cost included in pension expense (net of taxes of $3, $3 and $3 for 2020, 2019 and 2018, respectively) 8 9 10
Amortization of actuarial loss included in pension expense (net of taxes of $1,089, $657 and $979 for 2020, 2019 and 2018, respectively) 3,332 2,082 3,080
Net defined benefit pension plan activity (Note 19) 2,344 6,203 (3,990)
Cash flow hedges:      
Reclassifications to income in period (9) (9) (10)
Net cash flow hedge activity (Note 19) (9) (9) (10)
Other Comprehensive Income (638) 10,619 (41,966)
Comprehensive Income 127,018 113,720 69,139
Comprehensive Income Attributable to Noncontrolling Interest (959) 47 58
Comprehensive Income Attributable to Stepan Company $ 126,059 $ 113,767 $ 69,197