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Net Income Per Common Share Computations - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive 1,071,654 3,371,680 1,671,849 3,783,018