Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 31, 2019
Cover page.
Document Quarterly Report	true
Document Type	10-Q
Document Transition Report	false
Document Period End Date	Jun. 30, 2019
Entity File Number	001-12561
Entity Registrant Name	BELDEN INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3601505
Entity Address, Address Line One	1 North Brentwood Boulevard
Entity Address, Address Line Two	15th Floor
Entity Address, City or Town	St. Louis
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63105
City Area Code	314
Local Phone Number	854-8000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Category	Large Accelerated Filer
Entity Small Business	false
Document Transition Report	false
Entity Shell Company	false
Title of 12(b) Security	Common stock, $0.01 par value
Trading Symbol	BDC
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		45,452,492
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000913142
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2