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Stock-Based Compensation (Detail) - Stock-Based Compensation (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Total stock-based compensation expense	$ 336	$ 162	$ 665	$ 372
Tax benefit of stock-based compensation expense	(122)	(57)	(242)	(129)
After-tax effect of stock-based compensation	214	105	423	243
Stock Options and Restricted Stock Units [Member]
Total stock-based compensation expense	336	147	665	341
Deferred Directors Fees [Member]
Total stock-based compensation expense		$ 15		$ 31

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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