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