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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
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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.

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