Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,166,257
Other comprehensive income attributable to Belden before reclassifications	9,222
Amounts reclassified from accumulated other comprehensive loss	(74)
Net current period other comprehensive income (loss) attributable to Belden	9,148
Ending balance	1,155,845
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(41,279)
Ending balance	(32,131)
Foreign Currency Translation Component
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(26,514)
Other comprehensive income attributable to Belden before reclassifications	9,222
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income (loss) attributable to Belden	9,222
Ending balance	(17,292)
Pension and Other  Postretirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(14,765)
Other comprehensive income attributable to Belden before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	(74)
Net current period other comprehensive income (loss) attributable to Belden	(74)
Ending balance	$ (14,839)