Comprehensive Income and Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss), Net of Tax (Details) $ in Thousands	9 Months Ended
	Oct. 01, 2023 USD ($)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 1,143,950
Ending balance	1,199,403
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(5,871)
Other comprehensive loss attributable to Belden before reclassifications	253
Amounts reclassified from accumulated other comprehensive loss	(987)
Net current period other comprehensive loss attributable to Belden	(734)
Ending balance	(6,605)
Foreign Currency Translation Component
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,944)
Other comprehensive loss attributable to Belden before reclassifications	253
Amounts reclassified from accumulated other comprehensive loss	(139)
Net current period other comprehensive loss attributable to Belden	114
Ending balance	(1,830)
Pension and Other  Postretirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,927)
Other comprehensive loss attributable to Belden before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss	(848)
Net current period other comprehensive loss attributable to Belden	(848)
Ending balance	$ (4,775)