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Stock-Based Compensation (Detail) - Summary Of Changes In CSEs Outstanding (Common stock equivalents (CSEs), USD $)
9 Months Ended
Sep. 30, 2013
Common stock equivalents (CSEs)
 
Common Stock Equivalents (CSEs) [Roll Forward]  
Outstanding at December 31, 2012 (in shares) 100,545
Granted (in shares) 7,449
Converted to common shares (in shares) (5,975)
Outstanding at September 30, 2013 (in shares) 102,019.000
Per Share Weighted Average Grant Date Fair Value [Roll Forward]  
Outstanding at December 31, 2012 (in dollars per share) $ 16.89
Granted (in Dollars per share) $ 57.45
Converted to common shares (in Dollars per share) $ 57.44
Outstanding at September 30, 2013 (in Dollars per share) $ 17.48