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Stockholders' Equity - Stock Repurchase Activity (Detail) (Share Repurchase Plan [Member], USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Share Repurchase Plan [Member]
   
Equity, Class of Treasury Stock [Line Items]    
Shares repurchased, Shares 15,323 304,846
Total purchased, Total $ 88 $ 1,759