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Acquisitions - Schedule of Pro Forma Information (Details) - OTN Systems N.V. - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 04, 2021 | Jun. 28, 2020 | Jul. 04, 2021 | Jun. 28, 2020
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 603,171 | $ 432,941 | $ 1,140,750 | $ 901,641
Net income from continuing operations attributable to Belden common stockholders | $ 38,133 | $ 2,015 | $ 61,503 | $ 13,213
Diluted income from continuing operations per share attributable to Belden common stockholders | $ 0.84 | $ 0.05 | $ 1.36 | $ 0.29

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