NET INCOME PER SHARE (Calculation of Net Income per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 13,474	$ 10,995	$ 34,934	$ 32,553
Basic:
Basic weighted average EPS shares	24,096	24,526	24,124	24,692
Basic net income per share	$ 0.56	$ 0.45	$ 1.45	$ 1.32
Diluted:
Basic weighted average EPS shares	24,096	24,526	24,124	24,692
Dilutive common stock equivalents	27	77	27	87
Dilutive EPS shares	24,123	24,603	24,151	24,779
Diluted net income per share	$ 0.56	$ 0.45	$ 1.45	$ 1.31
Anti-dilutive shares	3	7	5	8