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Share-Based Compensation Plans - Summary of Activity Related to Restricted Stock Granted Under Incentive Plan (Detail) (Restricted stock grants [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restricted stock grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Shares, Outstanding, Beginning Balance	6,000	4,000	9,000
Total Shares, granted	563,000	6,000	4,000
Total Shares, vested	(6,000)	(4,000)	(9,000)
Total Shares, forfeited, canceled or expired	(10,000)
Total Shares, Outstanding, Ending Balance	553,000	6,000	4,000
Weighted Average Grant Date Fair Value, Beginning Balance	$ 13.88	$ 25.16	$ 14.88
Weighted Average Grant Date Fair Value, granted	$ 17.04	$ 13.88	$ 25.16
Weighted Average Grant Date Fair Value, vested	$ 13.88	$ 25.16	$ 14.88
Weighted Average Grant Date Fair Value, forfeited, canceled or expired	$ 17.03
Weighted Average Grant Date Fair Value, Ending Balance	$ 17.04	$ 13.88	$ 25.16

X

- Definition

Share-based compensation arrangement by Share-based payment award equity instruments other than option forfeited in period weighted average grant date fair value.

+ References

No definition available.

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- 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

-Section 50

-Paragraph 2

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

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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

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

-Publisher FASB

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Paragraph A240

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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

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