Stock Incentive Plans - Summary of Activity for SSARs and Stock Options (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares - Outstanding at December 31, 2012	311
Number of Shares - Granted
Number of Shares - Exercised
Number of Shares - Canceled or expired	(12)
Number of Shares - Outstanding at September 30, 2013	299
Number of Shares - Exercisable at September 30, 2013	299
Weighted Average Exercise Price - Outstanding at December 31, 2012	$ 8.66
Weighted Average Exercise Price - Granted
Weighted Average Exercise Price - Exercised
Weighted Average Exercise Price - Canceled or expired	$ 5.36
Weighted Average Exercise Price - Outstanding at September 30, 2013	$ 8.79
Weighted Average Exercise Price - Exercisable at September 30, 2013	$ 8.79
Weighted Average Remaining Life - Outstanding at September 30, 2013	3 months 7 days
Weighted Average Remaining Life - Exercisable at September 30, 2013	3 months 7 days
Aggregate Intrinsic Value - Outstanding at September 30, 2013
Aggregate Intrinsic Value - Exercisable at September 30, 2013

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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.

+ 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)(iii)

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Subparagraph (c)(1)(iv)(4)

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Gross number of share options (or share units) granted during the period.

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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 remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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