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Stock Compensation Plans - Performance Share Activity (Detail) (Performance Share [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Performance Share [Member]
Schedule Of Nonvested Restricted Stock Units Activities [Line Items]
Shares outstanding beginning balance	521,000
Shares vested	(290,000)
Shares forfeited	(102,000)
Shares outstanding ending balance	129,000	521,000
Weighted average remaining term (Years) beginning balance	1 year 26 days	1 year 4 months 13 days
Aggregate intrinsic value, Beginning balance	$ 4,255
Aggregate intrinsic value, Shares awarded	2,532
Aggregate intrinsic value, Ending balance	$ 997	$ 4,255

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Name Accounting Standards Codification

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-Subparagraph (c)(2)(i)-(ii)

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification

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- Definition

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