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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 14,741	$ 10,647	$ 29,853	$ 21,460
Basic:
Basic weighted average EPS shares	24,198	23,865	24,164	23,920
Basic net income per share	$ 0.61	$ 0.45	$ 1.24	$ 0.9
Diluted:
Basic weighted average EPS shares	24,198	23,865	24,164	23,920
Dilutive common stock equivalents	65	244	95	246
Dilutive EPS shares	24,263	24,109	24,259	24,166
Diluted net income per share	$ 0.61	$ 0.44	$ 1.23	$ 0.89
Anti-dilutive shares	5	7	3	6