Income (loss) per Share - Basis for Income Per Share Computations (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2023	Apr. 03, 2022
Numerator:
Income from continuing operations	$ 62,945	$ 44,096
Less: Net income (loss) attributable to noncontrolling interest	(247)	3
Income from continuing operations attributable to Belden stockholders	63,192	44,093
Add: Loss from discontinued operations, net of tax	0	(3,685)
Add: Loss on disposal of discontinued operations, net of tax	0	(4,567)
Net income attributable to Belden stockholders	$ 63,192	$ 35,841
Denominator:
Weighted average shares outstanding, basic (in shares)	42,827	44,811
Effect of dilutive common stock equivalents (in shares)	842	756
Weighted average shares outstanding, diluted (in shares)	43,669	45,567