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Financial Instruments - Valuation of Financial Instruments Recorded on Fair Value Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncurrent marketable securities | $ 5.2 | $ 3.4
Fair Value Measurements Recurring |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncurrent marketable securities | 5.2 | 3.4
Fair Value Measurements Recurring | Level 1 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Noncurrent marketable securities | $ 5.2 | $ 3.4

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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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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- Details
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