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Net Income Per Common Share - Schedule of Basic and Diluted Weighted Average Common Shares (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Share [Abstract]        
Basic weighted average common shares outstanding 18,088 17,747 18,030 17,897
Weighted average common equivalent shares 345 304 323 315
Diluted weighted average common shares outstanding 18,433 18,051 18,353 18,212
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive 1 27 10 177