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Stock-Based Compensation - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018
Stock Option and Stock Appreciation Rights (SARs) Granted Prior to 2017 [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period | 2 years
Stock Option and Stock Appreciation Rights (SARS) Granted in 2017 [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period | 3 years
Percentage of awards vesting in each year | 33.33%
Stock Option [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Weighted average period for amortization of unrecognized compensation cost | 2 years 2 months 12 days
Stock Awards [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Weighted average period for amortization of unrecognized compensation cost | 1 year 10 months 24 days
SARs [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Weighted average period for amortization of unrecognized compensation cost | 2 years 2 months 12 days

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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