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Acquisitions - Additional Information (Details) $ in Thousands, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 02, 2020 USD ($) employee | Jan. 02, 2020 CAD ($) employee | Jul. 30, 2018 USD ($) employee facilities | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 274,082 |  | $ 283,708 |  | $ 275,502
Operating lease, right-of-use asset |  |  |  |  |  | 41,300 |  |
Present value of lease liabilities |  |  |  |  |  | 8,766 |  |
Sotera Health LLC's Nordion Medical Isotope Business |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business combination, consideration transferred |  |  | $ 213,000 |  |  |  |  |
Property, plant and equipment |  |  | 12,948 |  |  |  |  |
Intangible assets |  |  | 139,257 |  |  |  |  |
Goodwill |  |  | $ 62,495 |  |  |  |  |
Number of personnel acquired | employee |  |  | 150 |  |  |  |  |
Number of operating facilities | facilities |  |  | 2 |  |  |  |  |
Increase in Amortization Expense | Sotera Health LLC's Nordion Medical Isotope Business |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price allocation adjustment, intangible assets |  |  |  | 3,500 | $ 6,000 |  |  |
Additional Interest Expense Associated with Incremental Borrowings | Sotera Health LLC's Nordion Medical Isotope Business |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price allocation adjustment, interest expense |  |  |  | 2,400 | $ 5,200 |  |  |
Elimination of Recognized Acquisition Related Costs | Sotera Health LLC's Nordion Medical Isotope Business |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Elimination of acquisition related costs |  |  |  | 2,500 |  |  |  |
Nuclear Services Group |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 45,000 |  | $ 45,000 |  | $ 45,000
Nuclear Services Group | Laker Energy Products, Ltd |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business combination, consideration transferred | $ 17,800 | $ 23.3 |  |  |  |  |  |
Business combination, contingent consideration |  |  |  |  |  |  | $ 5.0 |
Contingent consideration recognized in purchase price |  |  |  |  |  |  | $ 2.5 |
Property, plant and equipment | 8,400 |  |  |  |  |  |  |
Intangible assets | 8,200 |  |  |  |  |  |  |
Goodwill | 5,800 |  |  |  |  |  |  |
Operating lease, right-of-use asset | 2,700 |  |  |  |  |  |  |
Present value of lease liabilities | $ 2,700 |  |  |  |  |  |  |
Number of personnel acquired | employee | 140 | 140 |  |  |  |  |  |

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