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Summary of Significant Accounting Policies - Additional Information (Detail)
MMBTU in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
MMBTU
Customer
Subsidiary
Dec. 31, 2019
USD ($)
Customer
Dec. 31, 2018
USD ($)
Customer
Summary Of Significant Accounting Policy [Line Items]      
Cash and cash equivalents $ 349,938,000 $ 315,383,000  
Single customer comprised more than 10 percent of the Company's consolidated net sales | Customer 0 0 0
Cost of maintenance and repairs $ 69,234,000 $ 58,464,000 $ 57,010,000
Total research and development expenses $ 35,999,000 $ 34,139,000 $ 33,519,000
Capitalized Environmental expenditures depreciation period 10 years    
Indefinite-life intangible assets $ 0    
Number of foreign subsidiaries | Subsidiary 3    
Natural Gas [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Volume in derivative contract | MMBTU 0.9    
Purchased Contract Price $ 2,046,000    
Supply Contracts [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 4 years    
Building [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 30 years    
Building Improvements [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 15 years    
Minimum [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Concentration risk Payment terms extended 30 days    
Percentage of Tax benefit recognized 50.00%    
Minimum [Member] | Patents [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 10 years    
Minimum [Member] | Non-compete Agreements [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 3 years    
Minimum [Member] | Trademarks [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 10 years    
Minimum [Member] | Customer Relationships [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 5 years    
Minimum [Member] | Know-how [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 5 years    
Minimum [Member] | Manufacturing Equipment [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 10 years    
Minimum [Member] | Furniture and Fixtures [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 5 years    
Minimum [Member] | Vehicles [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 3 years    
Minimum [Member] | Computers Equipment And Software [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 3 years    
Maximum [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Concentration risk Payment terms extended 60 days    
Maximum [Member] | Patents [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 15 years    
Maximum [Member] | Non-compete Agreements [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 5 years    
Maximum [Member] | Trademarks [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 11 years    
Maximum [Member] | Customer Relationships [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 20 years    
Maximum [Member] | Know-how [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Finite-lived intangible asset, useful life 20 years    
Maximum [Member] | Manufacturing Equipment [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 15 years    
Maximum [Member] | Furniture and Fixtures [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 10 years    
Maximum [Member] | Vehicles [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 5 years    
Maximum [Member] | Computers Equipment And Software [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Lives used for calculating depreciation expense 10 years    
Money Market Funds [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Cash and cash equivalents $ 123,700,000    
Demand Deposit [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Cash and cash equivalents 76,100,000    
Non-U.S. Subsidiaries [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Cash and cash equivalents $ 150,100,000    
Nanjing Stepan Jinling Chemical Limited Liability Company [Member]      
Summary Of Significant Accounting Policy [Line Items]      
Ownership percentage 80.00%