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Stockholders' Equity - Stock Option Activities of Long-Term Incentive and Option Plans (Parenthetical) (Detail) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Stockholders Equity [Line Items]
Stock options outstanding related to discontinued operations	219,230	842,780
Exercise of stock options, shares	45,215
Stock options forfeited or expired related to discontinued operations	578,335
Discontinued Operations [Member]
Stockholders Equity [Line Items]
Stock options outstanding related to discontinued operations	221,000
Exercise of stock options, shares	44,000
Stock options forfeited or expired related to discontinued operations	177,000

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- Definition

Stockholders equity.

+ References

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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