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Schedule of Information Related to Stock Repurchase Programs (Parenthetical) (Detail) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |
Restricted shares forfeited by former employee | 431,375 |
Restricted Stock Purchase Plan |  |
Class of Stock [Line Items] |  |
Restricted shares forfeited by former employee | 10,791 | 2,500

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Details
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