Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Schedule of Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,166,257
Other comprehensive income (loss) attributable to Belden before reclassifications	38,007	$ (34,127)
Amounts reclassified from accumulated other comprehensive income	(260)	(1,281)
Net current period other comprehensive income (loss) attributable to Belden	37,747	(35,408)
Ending balance	1,294,736	1,166,257
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(41,279)	(5,871)
Ending balance	(3,532)	(41,279)
Foreign Currency Translation Component
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(26,514)	(1,944)
Other comprehensive income (loss) attributable to Belden before reclassifications	29,643	(24,431)
Amounts reclassified from accumulated other comprehensive income	0	(139)
Net current period other comprehensive income (loss) attributable to Belden	29,643	(24,570)
Ending balance	3,129	(26,514)
Pension and Other Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14,765)	(3,927)
Other comprehensive income (loss) attributable to Belden before reclassifications	8,364	(9,696)
Amounts reclassified from accumulated other comprehensive income	(260)	(1,142)
Net current period other comprehensive income (loss) attributable to Belden	8,104	(10,838)
Ending balance	$ (6,661)	$ (14,765)