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Change in Method of Accounting for Inventory Valuation - Summary of Financial Statement Line Items Affected by Retrospective Change in Accounting Principle and If no changes in Method of Accounting for U.S. Inventories (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
 [2]
Jun. 30, 2018
 [2]
Mar. 31, 2018
 [2]
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]                      
Cost of Sales [1]                 $ 1,519,031 $ 1,654,508 $ 1,578,840
Gross Profit $ 84,744 $ 77,402 $ 92,959 $ 84,609 $ 74,594 [2] $ 83,576 $ 89,981 $ 91,198 339,714 [1] 339,349 [1],[2] 346,167 [1]
Operating Income 28,491 27,966 41,065 29,738 35,451 [2] 27,145 45,386 41,283 127,260 [1] 149,265 [1],[2] 154,840 [1]
Income Before Provision for Income Taxes 27,886 27,449 39,534 31,030 30,585 [2] 24,694 43,198 39,292 125,899 [1],[3] 137,769 [1],[2],[3] 146,882 [1],[3]
Provision for Income Taxes [1]                 22,798 26,664 46,139
Net Income 22,033 25,880 30,210 24,978 23,954 [2] 21,754 33,452 31,945 103,101 [1] 111,105 [1],[2],[4] 100,743 [1],[4]
Net Income Attributable to Stepan Company $ 22,038 $ 25,889 $ 30,218 $ 24,984 $ 23,957 [2] $ 21,754 $ 33,454 $ 31,952 $ 103,129 [1] $ 111,117 [1],[2] $ 100,774 [1]
Net Income Per Diluted Common Share Attributable to Stepan Company $ 0.95 $ 1.11 $ 1.30 $ 1.07 $ 1.03 [2] $ 0.93 $ 1.44 $ 1.37 $ 4.42 [1] $ 4.76 [1],[2] $ 4.31 [1]
Balance Sheet [Abstract]                      
Inventories [5] $ 203,647       $ 231,528       $ 203,647 $ 231,528  
Other Non-Current Assets [5] 13,210       9,549       13,210 9,549  
Total Assets 1,579,367 [5]       1,514,614 [5]       1,579,367 [5] 1,514,614 [5] $ 1,502,892
Deferred Income Taxes [5] 23,391       24,961       23,391 24,961  
Retained Earnings [5],[6] 922,464       837,107       922,464 837,107  
Total Liabilities and Equity [5] 1,579,367       1,514,614       1,579,367 1,514,614  
Statement of Cash Flows [Abstract]                      
Net Income 22,033 $ 25,880 $ 30,210 $ 24,978 23,954 [2] $ 21,754 $ 33,452 $ 31,945 103,101 [1] 111,105 [1],[2],[4] 100,743 [1],[4]
Deferred Income Taxes [1]                 (5,016) 10,355 (1,001)
Change in Assets and Liabilities:                      
Inventories [1]                 28,460 (24,678) (1,990)
As Originally Reported Under LIFO [Member]                      
Income Statement [Abstract]                      
Cost of Sales                   1,652,354 1,586,485
Gross Profit                   341,503 338,522
Operating Income                   151,419 147,195
Income Before Provision for Income Taxes                   139,923 139,237
Provision for Income Taxes                   27,173 47,690
Net Income                   112,750 91,547
Net Income Attributable to Stepan Company                   $ 112,762 $ 91,578
Net Income Per Diluted Common Share Attributable to Stepan Company                   $ 4.83 $ 3.92
Balance Sheet [Abstract]                      
Inventories         200,165         $ 200,165  
Other Non-Current Assets         10,964         10,964  
Total Assets         1,484,666         1,484,666  
Deferred Income Taxes         18,672         18,672  
Retained Earnings         813,448         813,448  
Total Liabilities and Equity         1,484,666         1,484,666  
Statement of Cash Flows [Abstract]                      
Net Income                   112,750 $ 91,547
Deferred Income Taxes                   10,864 550
Change in Assets and Liabilities:                      
Inventories                   (26,832) 5,655
Effect of Change [Member]                      
Income Statement [Abstract]                      
Cost of Sales                 (4,000) 2,154 (7,645)
Gross Profit                 4,000 (2,154) 7,645
Operating Income                 4,000 (2,154) 7,645
Income Before Provision for Income Taxes                 4,000 (2,154) 7,645
Provision for Income Taxes                 983 (509) (1,551)
Net Income                 3,017 (1,645) 9,196
Net Income Attributable to Stepan Company                 $ 3,017 $ (1,645) $ 9,196
Net Income Per Diluted Common Share Attributable to Stepan Company                 $ 0.13 $ (0.07) $ 0.39
Balance Sheet [Abstract]                      
Inventories (27,363)       31,363       $ (27,363) $ 31,363  
Other Non-Current Assets 1,415       (1,415)       1,415 (1,415)  
Total Assets (25,948)       29,948       (25,948) 29,948  
Deferred Income Taxes (5,306)       6,289       (5,306) 6,289  
Retained Earnings (20,642)       23,659       (20,642) 23,659  
Total Liabilities and Equity (25,948)       $ 29,948       (25,948) 29,948  
Statement of Cash Flows [Abstract]                      
Net Income                 3,017 (1,645) $ 9,196
Deferred Income Taxes                 983 (509) (1,551)
Change in Assets and Liabilities:                      
Inventories                 (4,000) $ 2,154 $ (7,645)
As Computed under LIFO [Member]                      
Income Statement [Abstract]                      
Cost of Sales                 1,515,031    
Gross Profit                 343,714    
Operating Income                 131,260    
Income Before Provision for Income Taxes                 129,899    
Provision for Income Taxes                 23,781    
Net Income                 106,118    
Net Income Attributable to Stepan Company                 $ 106,146    
Net Income Per Diluted Common Share Attributable to Stepan Company                 $ 4.55    
Balance Sheet [Abstract]                      
Inventories 176,284               $ 176,284    
Other Non-Current Assets 14,625               14,625    
Total Assets 1,553,419               1,553,419    
Deferred Income Taxes 18,085               18,085    
Retained Earnings 901,822               901,822    
Total Liabilities and Equity $ 1,553,419               1,553,419    
Statement of Cash Flows [Abstract]                      
Net Income                 106,118    
Deferred Income Taxes                 (4,033)    
Change in Assets and Liabilities:                      
Inventories                 $ 24,460    
[1] The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[2] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO
[3] The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO
[4] The retained earnings and net income amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[5] The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[6] The 2019 amounts for the noted line items include an adjustment related to the Company’s first quarter 2019 adoption of Accounting Standards Update (ASU) No. 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive income.