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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 |

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