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Share-Based Compensation - Activity in Company's Plan (Detail) - 1999 Stock Option Plan [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2015, Number of Shares | shares	12,000
Exercised, Number of Shares | shares	0
Forfeited, Number of Shares | shares	0
Outstanding (exercisable and vested) at December 31, 2015, Number of Shares | shares	12,000
Outstanding at January 1, 2015, Weighted Average Exercise Price per Share | $ / shares	$ 41.44
Exercised, Weighted Average Exercise Price per Share | $ / shares	0.00
Forfeited, Weighted Average Exercise Price per Share | $ / shares	0.00
Outstanding (exercisable and vested) at December 31, 2015, Weighted Average Exercise Price per Share | $ / shares	$ 41.44
Outstanding (exercisable and vested), Weighted Average Remaining Contractual Term	1 year 9 months 18 days
Outstanding (exercisable and vested) Aggregate Intrinsic Value | $	$ 47

X

- 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.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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-Name Accounting Standards Codification
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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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