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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 28,276	$ 24,399	$ 58,593	$ 46,064
Basic:
Basic weighted average EPS shares	35,862	35,721	35,816	35,686
Basic net income per share	$ 0.79	$ 0.68	$ 1.64	$ 1.29
Diluted:
Basic weighted average EPS shares	35,862	35,721	35,816	35,686
Dilutive common stock equivalents	28	23	50	24
Dilutive EPS shares	35,890	35,744	35,866	35,710
Diluted net income per share	$ 0.79	$ 0.68	$ 1.63	$ 1.29
Anti-dilutive shares	10	6	11	6