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Acquisitions - Schedule of Pro Forma Information (Details) - Opterna International Corp. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Revenues | $ 2,139,894 | $ 2,213,781
Net income (loss) attributable to Belden common stockholders | $ (389,957) | $ 123,546
Diluted income (loss) per share attributable to Belden common stockholders (in dollars per share) | $ (9.24) | $ 3.02

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