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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ 9,100 |  |  |  | $ 12,900 | $ 9,100 |
Current portion of allowance for credit losses | 5,300 |  |  |  | $ 8,100 | 5,300 |
Weighted average amortization period of intangible assets, in years |  |  |  |  | 15 years |  |
Intangible asset amortization expense |  |  |  |  | $ 158,685 | 149,974 | $ 149,486
Reserve for returns and allowances | 7,200 |  |  |  | 14,600 | 7,200 |
Reserve for estimated rebates | 21,600 |  |  |  | 28,500 | 21,600 |
Cost of Sales |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset amortization expense |  |  |  |  | $ 84,400 |  |
Sales Revenue, Net | Hospitals And Healthcare Providers | Customer Concentration Risk |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 88.00% |  |
Sales Revenue, Net | Other Medical Device Manufacturers | Customer Concentration Risk |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 9.00% |  |
Sales Revenue, Net | Home Care Providers such as Pharmacies | Customer Concentration Risk |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 3.00% |  |
Revision of Prior Period, Adjustment | Cost of Sales |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset amortization expense | 20,500 | $ 20,600 | $ 20,700 | $ 20,800 |  | 82,600 | 81,600
Revision of Prior Period, Adjustment | Selling, General and Administrative Expenses |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Intangible asset amortization expense | $ (20,500) | $ (20,600) | $ (20,700) | $ (20,800) |  | $ (82,600) | $ (81,600)
Minimum | Intellectual property |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 5 years |  |
Minimum | Customer relationships |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 8 years |  |
Minimum | Distribution rights |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 10 years |  |
Minimum | Trade names |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 5 years |  |
Minimum | Non-complete agreement |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 3 years |  |
Maximum | Intellectual property |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 20 years |  |
Maximum | Customer relationships |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 27 years |  |
Maximum | Trade names |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 30 years |  |
Maximum | Non-complete agreement |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of Intangible assets, in years |  |  |  |  | 6 years |  |
Building |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of plant and equipment, in years |  |  |  |  | 30 years |  |
Machinery and Equipment | Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of plant and equipment, in years |  |  |  |  | 3 years |  |
Machinery and Equipment | Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of plant and equipment, in years |  |  |  |  | 15 years |  |
Computer Equipment and Software | Minimum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of plant and equipment, in years |  |  |  |  | 3 years |  |
Computer Equipment and Software | Maximum |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Useful life of plant and equipment, in years |  |  |  |  | 5 years |  |

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