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Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |  |
Depreciation and amortization expenses |  | $ 12.6 | $ 13.2 | $ 11.4
Costs related to terminated manufacturing obligations | $ 0.9 |  |  |
Manufacturing Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Original cost of impaired equipment | 23.4 | 23.4 |  |
Net book value of impaired equipment | $ 15.1 | $ 15.1 |  |

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Details
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