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SEGMENT INFORMATION (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ 567,901 | $ 507,092 | $ 1,659,145 | $ 1,543,366 |
Operating income (expense) | 96,550 | 76,573 | 231,048 | 201,925 |
Identifiable assets | 3,221,224 |  | 3,221,224 |  | $ 3,037,781
Commercial Industrial [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 294,158 | 276,179 | 865,070 | 841,812 |
Operating income (expense) | 46,774 | 39,067 | 121,088 | 108,076 |
Identifiable assets | 1,443,206 |  | 1,443,206 |  | 1,391,040
Defense [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 142,681 | 114,946 | 384,917 | 335,553 |
Operating income (expense) | 33,636 | 28,822 | 65,978 | 64,276 |
Identifiable assets | 1,051,580 |  | 1,051,580 |  | 751,859
Power [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | 132,102 | 117,929 | 412,667 | 370,798 |
Operating income (expense) | 19,486 | 14,130 | 60,896 | 44,872 |
Identifiable assets | 502,553 |  | 502,553 |  | 516,321
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (expense) | (3,346) | (5,446) | (16,914) | (15,299) |
Identifiable assets | 223,885 |  | 223,885 |  | $ 378,561
Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net sales | $ (1,040) | $ (1,962) | $ (3,509) | $ (4,797) |

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