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Summary of Stock Option Activity (Parenthetical) (Detail) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of options granted |  | 104,000 |  |
Outstanding amount of stock appreciation right units |  | 1,455,908 | [1] | 2,406,455
Exercisable amount of stock appreciation right units | [2] | 972,229 |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding amount of stock appreciation right units |  | 1,305,719 |  |
Exercisable amount of stock appreciation right units |  | 882,273 |  |
Stock Appreciation Rights (SARs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate number of stock issued by the company |  | 0 |  |
[1] | Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 1,305,719 shares of the Company's common stock issuable upon exercise.
[2] | Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 882,273 shares of the Company's common stock issuable upon exercise.

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- Definition Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Exercisable Number + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award Options and Stock Appreciation Rights Outstanding Number + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6415400&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 Net number of share options (or share units) granted during the 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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