NET INCOME PER SHARE (Calculation of Net Income per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 10,647	$ 10,333	$ 21,460	$ 21,558
Basic:
Basic weighted average EPS shares	23,865	24,626	23,920	24,776
Basic net income per share	$ 0.45	$ 0.42	$ 0.9	$ 0.87
Diluted:
Basic weighted average EPS shares	23,865	24,626	23,920	24,776
Dilutive common stock equivalents	244	64	246	92
Dilutive EPS shares	24,109	24,690	24,166	24,868
Diluted net income per share	$ 0.44	$ 0.42	$ 0.89	$ 0.87
Anti-dilutive shares	7	8	6	8