Acquisitions - Additional Information (Details) - USD ($)					3 Months Ended		12 Months Ended
	Dec. 06, 2019	Oct. 25, 2019	Apr. 15, 2019	Apr. 05, 2019	Mar. 29, 2020	Mar. 31, 2019	Dec. 31, 2021
Business Acquisition [Line Items]
Purchase price, net of cash acquired					$ (590,000)	$ 0
Severance, restructuring, and acquisition integration costs					3,619,000
Amortization of intangibles					16,185,000	18,164,000
Net income (loss)					$ (11,219,000)	25,178,000
Opterna International Corp.
Business Acquisition [Line Items]
Percentage of outstanding shares acquired			100.00%
Purchase price, net of cash acquired			$ 51,700,000
Acquisition price paid			45,900,000
Maximum earnout consideration			25,000,000.0
Estimated earnout consideration			5,800,000
Receivables			5,308,000
Property, plant, and equipment			1,328,000
Tax basis in acquired goodwill			$ 0
Net income attributable to Belden common stockholders						$ 19,243,000
Noncontrolling interest, purchase price		$ 800,000
Payments to acquire interest in subsidiaries		$ 400,000
Opterna International Corp. | Forecast
Business Acquisition [Line Items]
Payments to acquire interest in subsidiaries							$ 400,000
Special Product Compay
Business Acquisition [Line Items]
Purchase price, net of cash acquired	$ 22,500,000
Suttle, Inc. Asset Acquisition
Business Acquisition [Line Items]
Asset acquisition, consideration transferred				$ 5,000,000.0