EARNINGS PER SHARE (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share Reconciliation [Abstract]
Basic									46,624	48,019	46,991
Dilutive effect of stock options and deferred stock compensation									992	1,056	921
Diluted									47,616	49,075	47,912
Earnings from continuing operations	$ 1.56	$ 0.82	$ 0.85	$ 0.91	$ 0.96	$ 0.92	$ 0.90	$ 0.76	$ 4.12	$ 3.54	$ 2.97
Earnings from continuing operations	$ 1.53	$ 0.80	$ 0.83	$ 0.89	$ 0.94	$ 0.90	$ 0.87	$ 0.74	$ 4.04	$ 3.46	$ 2.91
Earnings from continuing operations	$ 70,762	$ 38,142	$ 40,121	$ 43,223	$ 46,132	$ 44,378	$ 43,009	$ 36,430	$ 192,248	$ 169,949	$ 139,404