NET INCOME PER SHARE (Calculation of Net Income per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 30,317	$ 21,665
Basic:
Basic weighted average EPS shares	35,794	35,659
Basic net income per share	$ 0.85	$ 0.61
Diluted:
Basic weighted average EPS shares	35,794	35,659
Dilutive common stock equivalents	13	25
Dilutive EPS shares	35,807	35,684
Diluted net income per share	$ 0.85	$ 0.61
Anti-dilutive shares	12	4