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Share-based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit recognized in additional paid-in capital upon vesting of restricted stock awards			$ 464,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards vested and charged	882,000.0	617,000.0	1,500,000	1,300,000
Total income tax benefit recognized related to restricted stock awards	341,000	232,000	563,000	488,000
Tax benefit recognized in additional paid-in capital upon vesting of restricted stock awards	464,000	214,000	464,000	709,000
Unrecognized compensation cost related to restricted stock awards	2,000,000		2,000,000
Compensation cost recognition weighted average period			1 year 6 months
Restricted Stock | Former Executive Chairman of Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards vested and charged	$ 440,000

X

- Definition

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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- Definition

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.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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