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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |
Weighted average amortization period of intangible assets, in years | 16 years |
Reserve for returns and allowances | $ 4.2 | $ 0.0
Reserve for estimated rebates | 18.1 | $ 12.2
Intellectual property |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Finite-lived intangible assets | 16.9 |
Finite-lived intangible assets, net of tax | $ 8.6 |
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 | 1 year |
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 | Distribution rights |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 17 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 | 10 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 |
Customer Concentration Risk [Member] | Sales Revenue, Net | Hospitals And Healthcare Providers |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 87.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net | Other Medical Device Manufacturers |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 9.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net | Home Care Providers such as Pharmacies |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Concentration risk, percentage | 4.00% |

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