Income Per Share - Schedule of Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
Numerator:
Net income	$ 51,937	$ 37,309
Less: Net loss attributable to noncontrolling interest	0	(4)
Net income attributable to Belden stockholders	$ 51,937	$ 37,313
Denominator:
Weighted average shares outstanding, basic (in shares)	40,166	40,986
Effect of dilutive common stock equivalents (in shares)	678	505
Weighted average shares outstanding, diluted (in shares)	40,844	41,491