SEGMENT INFORMATION (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014 segment		Jun. 30, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Number of operating segments					3
Net sales	$ 652,452		$ 597,694		$ 1,277,882		$ 1,166,247
Operating income (expense)	76,650		60,579		140,458		100,901
Identifiable assets	3,506,635				3,506,635				3,458,274
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales	276,280		241,960		543,205		462,416
Operating income (expense)	37,741		27,010		70,224		47,063
Identifiable assets	1,383,435				1,383,435				1,310,521
Defense [Member]
Segment Reporting Information [Line Items]
Net sales	192,690		193,632		380,336		381,807
Operating income (expense)	24,454		29,854		47,723		47,057
Identifiable assets	1,212,268				1,212,268				1,292,462
Energy [Member]
Segment Reporting Information [Line Items]
Net sales	185,233		164,074		357,972		325,617
Operating income (expense)	20,720		15,791		36,361		29,155
Identifiable assets	816,769				816,769				798,028
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales	(1,751)		(1,972)		(3,631)		(3,593)
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	(6,265)	[1]	(12,076)	[1]	(13,850)	[1]	(22,374)	[1]
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Identifiable assets	$ 94,163				$ 94,163				$ 57,263

[1] Corporate and eliminations includes pension expense, environmental remediation and administrative expenses, legal, foreign currency transactional gains and losses, and other expenses.