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Operating Segments and Geographic Information - Operating Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 27, 2015 | Jun. 28, 2015 | Mar. 29, 2015 | Dec. 31, 2014 | Sep. 28, 2014 | Jun. 29, 2014 | Mar. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues | $ 597,244 | $ 579,266 | $ 585,755 | $ 546,957 | $ 608,910 | $ 610,774 | $ 600,891 | $ 487,690 | $ 2,309,222 | $ 2,308,265 | $ 2,069,193
Depreciation expense |  |  |  |  |  |  |  |  | 46,600 | 43,700 | 43,600
Amortization of intangibles |  |  |  |  |  |  |  |  | 103,791 | 58,426 | 50,803
Severance, restructuring, and acquisition integration costs | 13,600 | $ 14,100 | $ 4,900 | $ 14,600 | 22,000 | $ 9,200 | 38,200 | $ 1,400 | 47,170 | 70,827 | 14,888
Purchase accounting effects of acquisitions |  |  |  |  |  |  | $ 7,400 |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 54,969 | 45,459 | 40,209
Segment assets | 3,315,841 |  |  |  | 3,260,670 |  |  |  | 3,315,841 | 3,260,670 | 2,751,753
Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 39,078 | 48,557 | 12,128
Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 723 | 3,318 | 400
Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 6,228 | 11,953 | 700
Network Security Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 972 |  |
Reportable Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 2,360,583 | 2,320,219 | 2,084,490
Affiliate revenues |  |  |  |  |  |  |  |  | 8,384 | 12,829 | 12,865
Segment EBITDA |  |  |  |  |  |  |  |  | 401,750 | 360,426 | 322,080
Depreciation expense |  |  |  |  |  |  |  |  | 46,551 | 43,736 | 43,648
Amortization of intangibles |  |  |  |  |  |  |  |  | 103,791 | 58,426 | 50,803
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 47,170 | 70,827 | 14,888
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 9,747 | 12,540 | 6,550
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 52,876 | 10,777 | 11,337
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 53,572 | 42,442 | 38,791
Segment assets | 934,280 |  |  |  | 960,782 |  |  |  | 934,280 | 960,782 | 833,585
Reportable Segment [Member] | Broadcast Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 900,637 | 928,586 | 679,197
Affiliate revenues |  |  |  |  |  |  |  |  | 1,371 | 1,381 | 933
Segment EBITDA |  |  |  |  |  |  |  |  | 142,428 | 140,367 | 109,541
Depreciation expense |  |  |  |  |  |  |  |  | 17,103 | 16,553 | 18,422
Amortization of intangibles |  |  |  |  |  |  |  |  | 50,989 | 50,739 | 46,005
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 39,078 | 48,557 | 12,128
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 132 | 8,574 | 6,550
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 2,446 | 10,777 | 11,337
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 27,900 | 17,912 | 10,526
Segment assets | 394,197 |  |  |  | 430,991 |  |  |  | 394,197 | 430,991 | 294,454
Reportable Segment [Member] | Enterprise Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 445,243 | 455,795 | 493,129
Affiliate revenues |  |  |  |  |  |  |  |  | 5,322 | 8,467 | 9,823
Segment EBITDA |  |  |  |  |  |  |  |  | 71,508 | 66,035 | 62,165
Depreciation expense |  |  |  |  |  |  |  |  | 11,783 | 13,744 | 12,469
Amortization of intangibles |  |  |  |  |  |  |  |  | 543 | 650 | 543
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 723 | 3,318 | 400
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 52 | 608 |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 9,788 | 12,574 | 11,749
Segment assets | 190,298 |  |  |  | 206,377 |  |  |  | 190,298 | 206,377 | 223,073
Reportable Segment [Member] | Industrial Connectivity Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 603,350 | 682,374 | 680,643
Affiliate revenues |  |  |  |  |  |  |  |  | 1,613 | 2,927 | 1,901
Segment EBITDA |  |  |  |  |  |  |  |  | 99,941 | 106,097 | 104,655
Depreciation expense |  |  |  |  |  |  |  |  | 11,235 | 11,145 | 10,308
Amortization of intangibles |  |  |  |  |  |  |  |  | 3,154 | 1,236 | 1,085
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 6,228 | 11,953 | 700
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 334 | 1,328 |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 8,836 | 10,053 | 14,496
Segment assets | 231,265 |  |  |  | 255,997 |  |  |  | 231,265 | 255,997 | 259,400
Reportable Segment [Member] | Industrial IT Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 244,303 | 253,464 | 231,521
Affiliate revenues |  |  |  |  |  |  |  |  | 70 | 54 | 208
Segment EBITDA |  |  |  |  |  |  |  |  | 43,253 | 47,927 | 45,719
Depreciation expense |  |  |  |  |  |  |  |  | 2,293 | 2,294 | 2,449
Amortization of intangibles |  |  |  |  |  |  |  |  | 5,859 | 5,801 | 3,170
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 169 | 6,999 | 1,660
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 32 | 2,030 |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 2,039 | 1,903 | 2,020
Segment assets | 55,285 |  |  |  | $ 67,417 |  |  |  | 55,285 | $ 67,417 | $ 56,658
Reportable Segment [Member] | Network Security Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment revenues |  |  |  |  |  |  |  |  | 167,050 |  |
Affiliate revenues |  |  |  |  |  |  |  |  | 8 |  |
Segment EBITDA |  |  |  |  |  |  |  |  | 44,620 |  |
Depreciation expense |  |  |  |  |  |  |  |  | 4,137 |  |
Amortization of intangibles |  |  |  |  |  |  |  |  | 43,246 |  |
Severance, restructuring, and acquisition integration costs |  |  |  |  |  |  |  |  | 972 |  |
Purchase accounting effects of acquisitions |  |  |  |  |  |  |  |  | 9,197 |  |
Deferred gross profit adjustments |  |  |  |  |  |  |  |  | 50,430 |  |
Acquisition of property, plant and equipment |  |  |  |  |  |  |  |  | 5,009 |  |
Segment assets | $ 63,235 |  |  |  |  |  |  |  | $ 63,235 |  |

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