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Stock-Based Compensation - Share Based Payment Awards Granted in Period (Detail) | 9 Months Ended
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Sep. 30, 2018 shares
Stock Option [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock options granted in period | 77,038
Stock Awards (at target) [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Awards granted in period | 49,426
SARs [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Awards granted in period | 171,131

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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