EARNINGS PER SHARE (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share Reconciliation [Abstract]
Basic weighted-average shares outstanding									46,743	46,372	45,823
Dilutive effect of stock options and deferred stock compensation									669	641	499
Diluted weighted-average shares outstanding									47,412	47,013	46,322
Income (Loss) from Continuing Operations Attributable to Parent	$ 38,169	$ 11,443	$ 22,835	$ 19,842	$ 36,280	$ 31,874	$ 29,042	$ 21,424	$ 92,289	$ 118,620	$ 97,884
Income (Loss) from Continuing Operations, Per Basic Share	$ 0.82	$ 0.24	$ 0.49	$ 0.42	$ 0.78	$ 0.69	$ 0.63	$ 0.46	$ 1.98	$ 2.56	$ 2.14
Earnings from continuing operations	$ 0.81	$ 0.24	$ 0.48	$ 0.42	$ 0.77	$ 0.68	$ 0.63	$ 0.45	$ 1.95	$ 2.52	$ 2.12