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Summary of significant accounting policies - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) segment tradename | Dec. 31, 2015 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |
Number of reporting units | segment | 6 |
Number of reporting units, two-step quantitative impairment test | segment | 3 |
Number of trade names | tradename | 3 |
Weighted average amortization period of intangible assets, in years | 15 years |
Reserve for estimated rebates | $ | $ 11.6 | $ 11.1
Minimum | Intellectual property |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 3 years |
Minimum | Customer Lists |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 5 years |
Minimum | Distribution rights |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 3 years |
Minimum | Trade names |  |
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 Lists |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 30 years |
Maximum | Distribution rights |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 22 years |
Maximum | Trade names |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 30 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 | 10 years |
Allowance for Sales Returns [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Reserve for returns and allowances | $ | $ 4.4 | $ 4.9

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