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Acquisitions (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 20, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  | $ 718,430 | $ 940,875 |
Goodwill | $ 2,039,033 |  | 2,039,033 | $ 1,702,463 | $ 1,741,496
Silgan Specialty Packaging |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  | $ 483,800 |  |  |
Goodwill |  | 200,700 |  |  |
Silgan Specialty Packaging | Customer Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets recognized in acquisitions |  | $ 166,000 |  |  |
Estimated remaining life |  | 22 years |  |  |
Silgan Specialty Packaging | Technology Know-How |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets recognized in acquisitions |  | $ 3,400 |  |  |
Estimated remaining life |  | 5 years |  |  |
Unicep Packaging |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash acquired | 236,900 |  |  |  |
Goodwill | 142,800 |  | 142,800 |  |
Unicep Packaging | Customer Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets recognized in acquisitions | $ 72,000 |  | 72,000 |  |
Estimated remaining life | 18 years |  |  |  |
Unicep Packaging | Technology Know-How |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets recognized in acquisitions | $ 4,000 |  | 4,000 |  |
Estimated remaining life | 10 years |  |  |  |
Unicep Packaging | Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets recognized in acquisitions | $ 3,700 |  | $ 3,700 |  |
Estimated remaining life | 10 years |  |  |  |

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