SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales		$ 547,522	$ 523,591
Operating income (expense)		64,498	47,692
Identifiable assets		3,179,059		$ 3,236,321
Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Net sales		296,753	279,056
Operating income (expense)		39,225	30,552
Identifiable assets		1,476,555		1,444,097
Defense [Member]
Segment Reporting Information [Line Items]
Net sales		120,883	114,837
Operating income (expense)		19,728	11,097
Identifiable assets		1,055,115		1,044,776
Power [Member]
Segment Reporting Information [Line Items]
Net sales		132,158	130,595
Operating income (expense)		15,342	15,545
Identifiable assets		487,278		482,753
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Identifiable assets		160,111		$ 264,695
Corporate and Eliminations [Member]
Segment Reporting Information [Line Items]
Operating income (expense)	[1]	(9,797)	(9,502)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales		$ (2,272)	$ (897)

[1] Corporate and eliminations includes pension and other postretirement benefit expense, certain environmental costs related to remediation at legacy sites, foreign currency transactional gains and losses, and certain other expenses.