DISCONTINUED OPERATIONS (Detail) (USD $) In Thousands, 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
Income Statement Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Gain on divestiture									$ 18,512	$ 0	$ 0
Earnings from discontinued operations	324	(144)	(95)	21,470	1,884	2,619	1,717	1,549	21,555	7,769	4,296
Heat Treating [Member]
Income Statement Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation									11,400
Heat Treating [Member] | Surface Technologies [Member]
Income Statement Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue									10,785	36,510	31,178
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									4,929	12,521	6,905
Discontinued Operation, Tax Effect of Discontinued Operation									1,886	4,752	2,609
Gain on divestiture									18,512	0	0
Earnings from discontinued operations									$ 21,555	$ 7,769	$ 4,296