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Inventory - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Raw Materials [Member]
Inventory [Line Items]
Inventory valuation reserves	$ 17.1	$ 17.6
Finished Goods [Member]
Inventory [Line Items]
Inventory valuation reserves	$ 12.8	$ 12.4

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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.

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- Definition

Amount of valuation reserve for inventory.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
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