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Goodwill and Other Intangibles - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill [Line Items]        
Goodwill acquired during period     $ 346,916  
Amortization of intangible assets $ 10,500 $ 10,400 31,100 $ 25,400
Finite-lived intangible asset, expected amortization, 2021 45,100   45,100  
Finite-lived intangible asset, expected amortization, 2022 52,800   52,800  
Finite-lived intangible asset, expected amortization, 2023 52,700   52,700  
Finite-lived intangible asset, expected amortization, 2024 52,700   52,700  
Finite-lived intangible asset, expected amortization, 2025 48,700   48,700  
Silgan Specialty Packaging and Unicep Packaging        
Goodwill [Line Items]        
Goodwill acquired during period     343,500  
Silgan Specialty Packaging and Unicep Packaging | Customer Relationships        
Goodwill [Line Items]        
Intangible assets recognized in acquisitions 238,000   238,000  
Silgan Specialty Packaging and Unicep Packaging | Technology Know-How        
Goodwill [Line Items]        
Intangible assets recognized in acquisitions 7,400   7,400  
Silgan Specialty Packaging and Unicep Packaging | Trade Names        
Goodwill [Line Items]        
Intangible assets recognized in acquisitions $ 3,700   $ 3,700