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Acquisitions - Schedule of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Apr. 01, 2018 | Apr. 02, 2017
Snell Advanced Media |  |
Business Acquisition [Line Items] |  |
Revenues | $ 614,184 | $ 579,371
Net income (loss) attributable to Belden common stockholders | $ (1,072) | $ 979
Diluted income (loss) per share attributable to Belden common stockholders (in usd per share) | $ (0.03) | $ 0.02
Thinklogical Holdings LLC |  |
Business Acquisition [Line Items] |  |
Revenues |  | $ 555,636
Net income (loss) attributable to Belden common stockholders |  | $ 12,880
Diluted income (loss) per share attributable to Belden common stockholders (in usd per share) |  | $ 0.30

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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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