Summary of Status of Stock Options and Changes during Period (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Stock Options
Outstanding at December 31, 2012	476
Exercised	(7)
Forfeited	(263)
Outstanding at December 31, 2013	206
Exercisable at December 31, 2013	206
Nonvested, expected to vest at December 31, 2013
Weighted- Average Exercise Price
Outstanding at December 31, 2012	$ 15.69
Exercised	$ 5.54
Forfeited	$ 15.84
Outstanding at December 31, 2013	$ 15.84
Exercisable at December 31, 2013	$ 15.84
Nonvested, expected to vest at December 31, 2013
Weighted- Average Remaining Contractual Life (Years)
Outstanding at December 31, 2012	1 year 10 months 24 days
Outstanding at December 31, 2013	10 months 24 days
Exercisable at December 31, 2013	10 months 24 days
Aggregate Intrinsic Value
Outstanding at December 31, 2012	$ 14
Exercised
Forfeited
Exercisable at December 31, 2013
Nonvested, expected to vest at December 31, 2013

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Share Based Compensation Arrangement By Share Based Payment Award, Options, Expected To Vest, Outstanding, Aggregate Intrinsic Value

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Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Outstanding Number

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Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term2

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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

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