Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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-Name Accounting Standards Codification

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-SubTopic 10

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Share Based Compensation Arrangement By Share Based Payment Award Expiration Period Description

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award For Shares Outstanding Restrictions Had Not Lapsed

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No definition available.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Grants In Period Number Of Employees

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Share Based Compensation Arrangement By Share Based Payment Award Non Qualified Option Outstanding Number

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Options And Restricted Stock Number Of Shares Available For Grant

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- Definition

Share Based Compensation Expense

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Equity Based Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding for which restrictions had not lapsed	244,018
Compensation expense	$ 0	$ 0	$ 0
Share based compensation expense	4,200,000
Restrictions will lapse in	2014 through 2017
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,743,000	$ 2,102,000	$ 2,032,000
Inducement options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of employees, awarded with inducement options	5
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified options to purchase shares	600,000
Maximum [Member] \| Amended 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares available for grant	1,750,000
Maximum [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	5 years
Maximum [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	4 years
Minimum [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	4 years
Minimum [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrictions on the stock granted lapsed	3 years