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, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	17,892	18,287	17,986	18,886
Weighted average common equivalent shares	173	262	245	283
Diluted weighted average common shares outstanding	18,065	18,549	18,231	19,169
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	1,503	610	1,069	591