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Stock-Based Compensation - Unrecognized Compensation Costs for Stock Options, Stock Awards and SARs (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Stock Option [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Unrecognized compensation costs for stock options, stock awards and SARs | $ 1,917 | $ 1,179
Stock Awards [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Unrecognized compensation costs for stock options, stock awards and SARs | 3,987 | 3,737
SARs [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Unrecognized compensation costs for stock options, stock awards and SARs | $ 4,155 | $ 2,398

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Balance Type: | debit
Period Type: | instant

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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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Namespace Prefix: |
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- Details
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