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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 29,383	$ 29,234	$ 87,976	$ 75,298
Basic:
Basic weighted average EPS shares	35,850	35,723	35,829	35,699
Basic net income per share	$ 0.82	$ 0.82	$ 2.46	$ 2.11
Diluted:
Basic weighted average EPS shares	35,850	35,723	35,829	35,699
Dilutive common stock equivalents	50	21	50	23
Dilutive EPS shares	35,900	35,744	35,879	35,722
Diluted net income per share	$ 0.82	$ 0.82	$ 2.45	$ 2.11
Anti-dilutive shares	8	6	10	6