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Operating Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 28, 2015 | Jun. 29, 2014 | Jun. 28, 2015 | Jun. 29, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | $ 585,755 | $ 600,891 | $ 1,132,712 | $ 1,088,581 |
Depreciation expense | 11,700 | 11,400 | 23,200 | 20,900 |
Amortization expense | 25,917 | 15,795 | 52,421 | 27,536 |
Severance, restructuring, and acquisition integration costs | 4,907 | 38,208 | 19,390 | 39,651 |
Segment assets | 3,502,643 |  | 3,502,643 |  | $ 3,262,827
Broadcast Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 3,283 | 27,524 | 14,821 | 28,967 |
Enterprise Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 83 | 1,821 | 640 | 1,821 |
Industrial Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 1,163 | 8,144 | 2,936 | 8,144 |
Network Security Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Severance, restructuring, and acquisition integration costs | 378 |  | 1,045 |  |
Reportable Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 598,513 | 605,054 | 1,167,964 | 1,093,361 |
Affiliate revenues | 2,127 | 2,203 | 4,441 | 5,836 |
Segment EBITDA | 100,345 | 89,253 | 188,619 | 162,869 |
Depreciation expense | 11,692 | 11,400 | 23,233 | 20,897 |
Amortization expense | 25,917 | 15,795 | 52,421 | 27,536 |
Severance, restructuring, and acquisition integration costs | 4,907 | 38,208 | 19,390 | 39,651 |
Purchase accounting effects of acquisitions |  | 8,163 | 9,422 | 9,015 |
Deferred gross profit adjustments | 13,440 | 3,915 | 35,098 | 4,365 |
Segment assets | 1,005,497 | 1,010,546 | 1,005,497 | 1,010,546 |
Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 219,415 | 252,278 | 433,001 | 418,763 |
Affiliate revenues | 380 | 84 | 721 | 283 |
Segment EBITDA | 31,614 | 31,318 | 60,846 | 57,489 |
Depreciation expense | 4,373 | 4,609 | 8,558 | 7,490 |
Amortization expense | 12,889 | 14,424 | 25,609 | 24,943 |
Severance, restructuring, and acquisition integration costs | 3,283 | 27,524 | 14,821 | 28,967 |
Purchase accounting effects of acquisitions |  | 7,148 |  | 7,458 |
Deferred gross profit adjustments | (924) | 3,915 | 2,370 | 4,365 |
Segment assets | 410,194 | 419,814 | 410,194 | 419,814 |
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 117,335 | 121,272 | 222,030 | 229,666 |
Affiliate revenues | 1,330 | 1,628 | 2,950 | 3,704 |
Segment EBITDA | 21,101 | 19,667 | 34,982 | 33,842 |
Depreciation expense | 2,947 | 3,799 | 5,949 | 7,499 |
Amortization expense | 135 | 167 | 273 | 335 |
Severance, restructuring, and acquisition integration costs | 83 | 1,821 | 640 | 1,821 |
Purchase accounting effects of acquisitions |  | 147 |  | 286 |
Segment assets | 222,015 | 236,860 | 222,015 | 236,860 |
Reportable Segment [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 160,875 | 178,244 | 313,847 | 337,562 |
Affiliate revenues | 407 | 485 | 731 | 1,841 |
Segment EBITDA | 28,680 | 29,462 | 52,853 | 53,144 |
Depreciation expense | 2,869 | 2,458 | 5,720 | 4,842 |
Amortization expense | 807 | 271 | 1,630 | 536 |
Severance, restructuring, and acquisition integration costs | 1,163 | 8,144 | 2,936 | 8,144 |
Purchase accounting effects of acquisitions |  | 250 | 267 | 533 |
Segment assets | 267,448 | 282,874 | 267,448 | 282,874 |
Reportable Segment [Member] | Industrial IT Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 61,270 | 53,260 | 122,343 | 107,370 |
Affiliate revenues | 10 | 6 | 31 | 8 |
Segment EBITDA | 10,178 | 8,806 | 21,265 | 18,394 |
Depreciation expense | 584 | 534 | 1,143 | 1,066 |
Amortization expense | 1,479 | 933 | 2,889 | 1,722 |
Severance, restructuring, and acquisition integration costs |  | 719 | (52) | 719 |
Purchase accounting effects of acquisitions |  | 618 |  | 738 |
Segment assets | 63,599 | $ 70,998 | 63,599 | $ 70,998 |
Reportable Segment [Member] | Network Security Solutions [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Segment revenues | 39,618 |  | 76,743 |  |
Affiliate revenues |  |  | 8 |  |
Segment EBITDA | 8,772 |  | 18,673 |  |
Depreciation expense | 919 |  | 1,863 |  |
Amortization expense | 10,607 |  | 22,020 |  |
Severance, restructuring, and acquisition integration costs | 378 |  | 1,045 |  |
Purchase accounting effects of acquisitions |  |  | 9,155 |  |
Deferred gross profit adjustments | 14,364 |  | 32,728 |  |
Segment assets | $ 42,241 |  | $ 42,241 |  |

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