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Expense Recorded For Restricted Stock And Cash Entitlements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Expense	$ 628	$ 636	$ 405
Cash Entitlement Expense	588	564	380
Tax Effect	(493)	(475)	(311)
Net of Tax	$ 723	$ 725	$ 474

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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