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Inventory - Additional Information (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Raw Materials [Member] |  |
Inventory [Line Items] |  |
Inventory valuation reserves | $ 17.2 | $ 15.0
Finished Goods [Member] |  |
Inventory [Line Items] |  |
Inventory valuation reserves | $ 10.6 | $ 8.3

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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