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Summary of significant accounting policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 tradename unit | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of reporting units | unit | 6 |  |  |
Number of reporting units, two-step quantitative impairment test | unit | 3 |  |  |
Number of trade names | tradename | 2 |  |  |
Impairment charges |  | $ 0 | $ 0 | $ 10,841,000
Weighted average amortization period of intangible assets, in years |  | 15 years |  |
Reserve for returns and allowances |  | $ 4,900,000 | 4,100,000 |
Reserve for estimated rebates |  | $ 11,100,000 | $ 10,400,000 |
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 |  |
Land Improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of plant and equipment, in years |  | 5 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 |  |

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