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Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 943,374 | $ 773,048
Acquisitions and purchase accounting adjustments | 476,040 | 192,554
Translation impact | (34,299) | (22,228)
Goodwill, Ending Balance | 1,385,115 | 943,374
Broadcast Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 573,504 | 466,375
Acquisitions and purchase accounting adjustments | 11,481 | 119,918
Translation impact | (25,455) | (12,789)
Goodwill, Ending Balance | 559,530 | 573,504
Enterprise Connectivity Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 50,136 | 50,136
Acquisitions and purchase accounting adjustments | 0 | 0
Translation impact | 0 | 0
Goodwill, Ending Balance | 50,136 | 50,136
Industrial Connectivity Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 200,053 | 187,975
Acquisitions and purchase accounting adjustments | 1,614 | 16,442
Translation impact | (4,948) | (4,364)
Goodwill, Ending Balance | 196,719 | 200,053
Industrial IT Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 119,681 | 68,562
Acquisitions and purchase accounting adjustments | 730 | 56,194
Translation impact | (3,896) | (5,075)
Goodwill, Ending Balance | 116,515 | $ 119,681
Network Security Solutions [Member] |  |
Goodwill [Line Items] |  |
Acquisitions and purchase accounting adjustments | 462,215 |
Goodwill, Ending Balance | $ 462,215 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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