Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Schedule of Total Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
Equity [Abstract]
Net income	$ 51,937	$ 37,309
Foreign currency translation adjustments, net of tax	(37,360)	9,222
Adjustments to pension and postretirement liability, net of tax	210	(74)
Total comprehensive income	14,787	46,457
Less: Comprehensive loss attributable to noncontrolling interests	0	(4)
Comprehensive income attributable to Belden	$ 14,787	$ 46,461