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SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 611,881 | $ 567,901 | $ 567,653 | $ 523,591 | $ 565,566 | $ 507,092 | $ 532,766 | $ 503,507 | $ 2,271,026 | $ 2,108,931 | $ 2,205,683
Operating income |  |  |  |  |  |  |  |  | 339,743 | 308,098 | 310,617
Depreciation and amortization |  |  |  |  |  |  |  |  | 99,995 | 96,008 | 100,810
Total assets | 3,236,321 |  |  |  | 3,037,781 |  |  |  | 3,236,321 | 3,037,781 | 2,989,611
Capital expenditures related to discontinued operations |  |  |  |  |  |  |  |  |  |  | 200
Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (23,200) | (23,215) | (34,790)
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 2,271,026 | 2,108,931 | 2,205,683
Operating income |  |  |  |  |  |  |  |  | 339,743 | 308,098 | 310,617
Depreciation and amortization |  |  |  |  |  |  |  |  | 99,995 | 96,008 | 99,475
Total assets | 3,236,321 |  |  |  | 3,037,781 |  |  |  | 3,236,321 | 3,037,781 | 2,989,611
PropertyPlantAndEquipmentAdditions |  |  |  |  |  |  |  |  | 52,705 | 46,776 | 35,512
Operating Segments [Member] | Commercial/Industrial |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment |  |  |  |  |  |  |  |  | 1,163,510 | 1,120,326 | 1,189,120
Operating income |  |  |  |  |  |  |  |  | 168,328 | 156,550 | 171,525
Depreciation and amortization |  |  |  |  |  |  |  |  | 53,180 | 53,970 | 55,799
Total assets | 1,444,097 |  |  |  | 1,391,040 |  |  |  | 1,444,097 | 1,391,040 | 1,480,052
PropertyPlantAndEquipmentAdditions |  |  |  |  |  |  |  |  | 29,028 | 30,145 | 21,990
Operating Segments [Member] | Defense |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment |  |  |  |  |  |  |  |  | 557,954 | 469,796 | 479,528
Operating income |  |  |  |  |  |  |  |  | 109,355 | 98,291 | 98,895
Depreciation and amortization |  |  |  |  |  |  |  |  | 20,702 | 14,488 | 15,965
Total assets | 1,044,776 |  |  |  | 751,859 |  |  |  | 1,044,776 | 751,859 | 800,613
PropertyPlantAndEquipmentAdditions |  |  |  |  |  |  |  |  | 9,276 | 5,870 | 3,834
Operating Segments [Member] | Power |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment |  |  |  |  |  |  |  |  | 554,048 | 524,967 | 545,013
Operating income |  |  |  |  |  |  |  |  | 85,260 | 76,472 | 74,987
Depreciation and amortization |  |  |  |  |  |  |  |  | 22,019 | 23,032 | 23,419
Total assets | 482,753 |  |  |  | 516,321 |  |  |  | 482,753 | 516,321 | 629,612
PropertyPlantAndEquipmentAdditions |  |  |  |  |  |  |  |  | 10,039 | 6,653 | 6,163
Operating Segments [Member] | Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  | (23,200) | (23,215) | (34,790)
Depreciation and amortization |  |  |  |  |  |  |  |  | 4,094 | 4,518 | 4,292
Total assets | $ 264,695 |  |  |  | $ 378,561 |  |  |  | 264,695 | 378,561 | 79,334
PropertyPlantAndEquipmentAdditions |  |  |  |  |  |  |  |  | 4,362 | 4,108 | 3,525
Operating Segments [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information, Revenue for Reportable Segment |  |  |  |  |  |  |  |  | $ (4,486) | $ (6,158) | $ (7,978)

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