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Acquisitions - Schedule of Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Snell Advanced Media |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues | $ 659,003 | $ 644,017 | $ 1,944,628 | $ 1,857,885
Net income (loss) attributable to Belden common stockholders | $ 92,769 | $ (24,050) | $ 126,937 | $ (19,056)
Diluted income (loss) per share attributable to Belden common stockholders (in usd per share) | $ 2.13 | $ (0.57) | $ 3.08 | $ (0.45)
Thinklogical Holdings LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenues |  | $ 621,745 |  | $ 1,792,614
Net income (loss) attributable to Belden common stockholders |  | $ (5,128) |  | $ 37,097
Diluted income (loss) per share attributable to Belden common stockholders (in usd per share) |  | $ (0.12) |  | $ 0.87

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