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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	18,062	17,892	17,896	17,986
Weighted average common equivalent shares	373	173	272	245
Diluted weighted average common shares outstanding	18,435	18,065	18,168	18,231
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	82	1,503	910	1,069