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Leases - Components of Lease Expense included in Consolidated Statement of Income (Detail) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Lessor Lease Description [Line Items] |
Total lease expense | $ 819
Selling, General and Administrative Expenses [Member] |
Lessor Lease Description [Line Items] |
Total lease expense | 349
Research and Development Expenses [Member] |
Lessor Lease Description [Line Items] |
Total lease expense | 454
Cost of Sales [Member] |
Lessor Lease Description [Line Items] |
Total lease expense | $ 16

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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Balance Type: |
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- Details
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Balance Type: |
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