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Earnings Per Share - Securities Not Included in the Computation of Diluted Earnings Per Share (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Earnings Per Share [Abstract]        
Options to purchase shares of common stock 0 1,203 41 1,049