Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Total Comprehensive Income (Loss) (Details) - USD ($) $ 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
Equity [Abstract]
Net income	$ 49,034	$ 37,309	$ 68,775	$ 62,945	$ 86,343	$ 131,720
Foreign currency translation adjustments, net of tax	6,986		(4,577)		16,208	(21,595)
Adjustments to pension and postretirement liability, net of tax	(74)		(284)		(148)	(564)
Total comprehensive income	55,946		63,914		102,403	109,561
Less: Comprehensive income (loss) attributable to noncontrolling interests	(10)		24		(14)	(221)
Comprehensive income attributable to Belden	$ 55,956		$ 63,890		$ 102,417	$ 109,782