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Acquisitions - Pro Forma Effect on Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Thinklogical Holdings LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues | $ 2,399,715 | $ 2,407,830 |
Net income attributable to Belden common stockholders | $ 60,690 | $ 113,014 |
Diluted income per share attributable to Belden common stockholders | $ 1.42 | $ 2.66 |
Tripwire [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues |  |  | $ 2,354,191
Net income attributable to Belden common stockholders |  |  | $ 92,104
Diluted income per share attributable to Belden common stockholders |  |  | $ 2.14

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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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