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Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance | $ 1,385,995 | $ 1,385,115
Acquisitions and purchase accounting adjustments | 71,394 | 8,492
Translation impact | 20,868 | (2,135)
Reclassify to assets held for sale |  | (5,477)
Goodwill, Ending Balance | 1,478,257 | 1,385,995
Broadcast Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance | 544,042 | 536,388
Acquisitions and purchase accounting adjustments | 71,394 | 8,492
Translation impact | 13,557 | (838)
Reclassify to assets held for sale |  | 0
Goodwill, Ending Balance | 628,993 | 544,042
Enterprise Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance | 73,278 | 73,278
Acquisitions and purchase accounting adjustments | 0 | 0
Translation impact | 0 | 0
Reclassify to assets held for sale |  | 0
Goodwill, Ending Balance | 73,278 | 73,278
Industrial Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance | 191,322 | 196,719
Acquisitions and purchase accounting adjustments | 0 | 0
Translation impact | 2,790 | 80
Reclassify to assets held for sale |  | (5,477)
Goodwill, Ending Balance | 194,112 | 191,322
Network Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill, Beginning Balance | 577,353 | 578,730
Acquisitions and purchase accounting adjustments | 0 | 0
Translation impact | 4,521 | (1,377)
Reclassify to assets held for sale |  | 0
Goodwill, Ending Balance | $ 581,874 | $ 577,353

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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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits 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 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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