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Net Income Per Common Share - Additional Information (Detail) - shares
shares in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Stock Option And Restricted Stock Awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
University's stock options and restricted stock awards outstanding were excluded from the calculation of diluted earnings 345 117