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Equity Based Compensation - Summary of Compensation Expense Charged Against Pretax Loss Under Restricted Stock And Stock Options Award (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Income tax benefit
Restricted stock and stock option awards [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Compensation expense	328	350
Restricted stock and stock option awards [Member] \| 2008 Plan [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Compensation expense	135	160
Restricted stock and stock option awards [Member] \| 2011 Plan [Member]
Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Compensation expense	$ 193	$ 190

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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