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Stock-Based Compensation - Components of Stock-Based Compensation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total stock-based compensation expense	$ 1,798	$ 1,306	$ 2,810
Tax benefit of stock-based compensation expense	(671)	(472)	(959)
After-tax effect of stock based compensation	1,127	834	1,851
Stock options
Total stock-based compensation expense	(245)	(66)	2,077
Restricted stock units
Total stock-based compensation expense	2,043	1,314	672
Deferred directors fees
Total stock-based compensation expense	$ 0	$ 58	$ 61

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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