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Stock-Based Compensation (Detail) - Stock-Based Compensation (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Total stock-based compensation expense	$ 542	$ 472	$ 1,207	$ 844
Tax benefit of stock-based compensation expense	(203)	(173)	(450)	(302)
After-tax effect of stock-based compensation	339	299	757	542
Stock Options and Restricted Stock Units [Member]
Total stock-based compensation expense	542	460	1,207	800
Deferred Directors Fees [Member]
Total stock-based compensation expense	$ 0	$ 12	$ 0	$ 44

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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