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Pre-tax Compensation Expense and Excess Tax Benefit Recognized in Earnings (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Pre-tax compensation expense $ 574 $ 206 $ 98
Excess tax benefit $ 9 $ 6 $ 5