Income Per Share - Schedule of Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 29, 2025	Mar. 30, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 29, 2025	Jun. 30, 2024
Numerator:
Net income	$ 61,006		$ 49,034	$ 37,309	$ 112,943	$ 86,343
Less: Net loss attributable to noncontrolling interest	0		(10)		0	(14)
Net income attributable to Belden stockholders	$ 61,006	$ 51,937	$ 49,044		$ 112,943	$ 86,357
Denominator:
Weighted average shares outstanding, basic (in shares)	39,511		40,690		39,835	40,838
Effect of dilutive common stock equivalents (in shares)	491		514		583	510
Weighted average shares outstanding, diluted (in shares)	40,002		41,204		40,418	41,348