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Acquisitions - Additional Information (Detail) |  |  | 3 Months Ended | 12 Months Ended |
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Oct. 03, 2016 USD ($) Customer T | Oct. 03, 2016 BRL | Jun. 15, 2015 USD ($) T | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Oct. 03, 2016 BRL Customer T
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid from cash on hand |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,510,000 |  | $ 5,133,000 |  |  |  |
Net sales |  |  |  |  | $ 420,636,000 |  | $ 445,030,000 |  | $ 454,603,000 |  | $ 445,897,000 |  | $ 419,291,000 | $ 444,011,000 | $ 452,414,000 | $ 460,451,000 | 1,766,166,000 | [1] | 1,776,167,000 | [1] | $ 1,927,213,000 | [1] |
Net income |  |  |  |  | 8,417,000 | [2] | $ 21,362,000 | [2] | $ 28,496,000 | [2] | $ 27,916,000 | [2] | 12,872,000 | $ 24,912,000 | $ 16,914,000 | $ 21,270,000 | 86,191,000 | [2] | 75,968,000 |  | 57,101,000 |  |
Goodwill |  |  |  |  | 25,308,000 |  |  |  |  |  |  |  | 11,265,000 |  |  |  | 25,308,000 |  | 11,265,000 |  | 11,502,000 |  |
Asset acquisition purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 103,076,000 |  | 119,349,000 |  | 101,819,000 |  |
Sun Products Corporation's (SUN's) Pasadena, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,000,000 |  |  |  |
Acquisition of land |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,377,000 |  |  |  |
Acquisition of manufacturing assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,623,000 |  |  |  |
Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Minimum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Maximum [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |
Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | [1] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 74,961,000 |  | 63,439,000 |  | 65,165,000 |  |
Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 19,491,000 |  |  |  |  |  |  |  | $ 5,402,000 |  |  |  | $ 19,491,000 |  | 5,402,000 |  | $ 5,558,000 |  |
Tebras And PBC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  | $ 7,354,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  | 5,716,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of liabilities |  | 3,487,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 14,327,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tebras And PBC [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  | 4,331,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 years |  |  |  |  |  |
Tebras And PBC [Member] | Supply Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  | 2,555,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Tebras And PBC [Member] | Non-compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  | 468,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization periods for the identifiable intangible assets at the time of acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Tebras And PBC [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |  |  |
Tebras And PBC [Member] | Brazil [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  |
Tebras And PBC [Member] | Surfactants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition-related expenses |  | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of production facility | T |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000
Acquisitions purchase price, including adjustments for working capital |  | $ 29,075,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | BRL 93,309,000
Paid from cash on hand |  | 21,812,000 | BRL 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposited in escrow |  | 2,804,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000
Unpaid working capital adjustments |  | $ 4,459,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | BRL 14,309,000
Tebras And PBC [Member] | Surfactants [Member] | Brazil [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | Customer |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200
Procter and Gamble Company [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business And Asset Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capacity of production facility | T |  |  |  | 30,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid from cash on hand |  |  |  | $ 5,133,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of intangible assets |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  | 6,007,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of liabilities |  |  |  | 874,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net sales are attributed to countries based on the location of the Company facility making the sales.
[2] | The amounts for net income, net income attributable to Stepan Company and net income attributable to Stepan Company per diluted share for the first, second and third quarters of 2016 have been changed from the amounts originally reported as a result of the Company’s early adoption of ASU No. 2016-9, Compensation – Stock Compensation (Topic 718): Improvement to Employee Share-Based Payment Accounting. See Note 1 for additional information regarding ASU No. 2016-9. Below are the originally reported amounts for the items that changed: 2016 (In thousands, except per share data) First Second Third Net Income $27,657 $27,870 $20,432 Net Income Attributable to Stepan Company 27,654 27,865 20,427 Per Diluted Share 1.21 1.21 0.89

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