Income per Share - Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jul. 02, 2023	Apr. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Numerator:
Net income	$ 49,034	$ 37,309	$ 68,775	$ 62,945	$ 86,343	$ 131,720
Less: Net income (loss) attributable to noncontrolling interest	(10)		22		(14)	(225)
Net income attributable to Belden stockholders	$ 49,044		$ 68,753		$ 86,357	$ 131,945
Denominator:
Weighted average shares outstanding, basic (in shares)	40,690		42,497		40,838	42,663
Effect of dilutive common stock equivalents (in shares)	514		591		510	717
Weighted average shares outstanding, diluted (in shares)	41,204		43,088		41,348	43,380