SEGMENT INFORMATION (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items]
Assets held for sale	$ 0				$ 147,347				$ 0	$ 147,347
Net sales	588,755	$ 525,535	$ 545,194	$ 546,199	572,586	$ 558,383	$ 569,198	$ 542,959	2,205,683	2,243,126	$ 2,118,081
Operating income									310,617	282,373	237,123
Depreciation and amortization									100,810	118,931	121,497
Total assets	3,029,378				3,399,511				3,029,378	3,399,511	3,458,274
Capital expenditures related to discontinued operations									200	4,900	7,000
Corporate And Other [Member]
Segment Reporting Information [Line Items]
Operating income									(34,790)	(30,312)	(41,944)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales									2,205,683	2,243,126	2,118,081
Operating income									310,617	282,373	237,123
Depreciation and amortization									99,475	104,925	102,215
Total assets	3,029,378				3,399,511				3,029,378	3,399,511	3,458,274
PropertyPlantAndEquipmentAdditions									35,512	67,115	72,242
Operating Segments [Member] | Commercial Industrial [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									1,189,120	1,232,696	1,079,826
Operating income									171,525	178,684	131,305
Depreciation and amortization									55,799	58,276	56,841
Total assets	1,500,931				1,543,795				1,500,931	1,543,795	1,509,011
PropertyPlantAndEquipmentAdditions									21,990	37,329	48,696
Operating Segments [Member] | Defense [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									479,528	492,094	481,850
Operating income									98,895	82,552	74,360
Depreciation and amortization									15,965	19,530	19,235
Total assets	808,197				845,193				808,197	845,193	888,689
PropertyPlantAndEquipmentAdditions									3,834	5,175	3,443
Operating Segments [Member] | Power [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									545,013	527,034	563,405
Operating income									74,987	51,449	73,402
Depreciation and amortization									23,419	23,060	21,484
Total assets	642,655				579,736				642,655	579,736	581,323
PropertyPlantAndEquipmentAdditions									6,163	16,057	12,144
Operating Segments [Member] | Corporate And Other [Member]
Segment Reporting Information [Line Items]
Operating income									(34,790)	(30,312)	(41,944)
Depreciation and amortization									4,292	4,059	4,655
Total assets	77,595				283,441				77,595	283,441	57,691
PropertyPlantAndEquipmentAdditions									3,525	8,554	7,959
Operating Segments [Member] | Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Revenue for Reportable Segment									(7,978)	(8,698)	(7,000)
Operating Segments [Member] | Held-for-sale [Member]
Segment Reporting Information [Line Items]
Total assets	$ 0				$ 147,346				$ 0	$ 147,346	$ 421,560