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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Amortization expense | $ 44.6 | $ 36.2 | $ 27.1
Expected amortization expense in 2022 | 53.8 |  |
Expected amortization expense in 2023 | 53.8 |  |
Expected amortization expense in 2024 | 50.4 |  |
Expected amortization expense in 2025 | 49.6 |  |
Expected amortization expense in 2026 | 48.4 |  |
Silgan Specialty Packaging And Unicep Packaging | Customer Relationships |  |  |
Goodwill [Line Items] |  |  |
Customer relationship intangible asset | 246.1 |  |
Silgan Specialty Packaging And Unicep Packaging | Technology-Based Intangible Assets |  |  |
Goodwill [Line Items] |  |  |
Customer relationship intangible asset | 8.6 |  |
Silgan Specialty Packaging And Unicep Packaging | Trade names |  |  |
Goodwill [Line Items] |  |  |
Customer relationship intangible asset | $ 4.8 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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