Net Income Per Common Share - Schedule of Basic and Diluted Weighted Average Common Shares (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Basic weighted average common shares outstanding	17,863	18,007	17,812	18,033
Weighted average common equivalent shares	282	261	223	281
Diluted weighted average common shares outstanding	18,145	18,268	18,035	18,314
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive	911	1,012	1,324	852