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Summary of significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |
Weighted average amortization period of intangible assets, in years | 13 years |
Reserve for estimated rebates | $ 12.2 | $ 11.6
Minimum | Intellectual property |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 7 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 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Useful life of Intangible assets, in years | 2 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 | 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 [Member] |  |
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 |
Allowance for Sales Returns |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Reserve for returns and allowances | $ 4.2 | $ 4.4

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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