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v3.19.3.a.u2

Noncontrolling Interest - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Variable Interest Entity, primary beneficiary Belden |
Noncontrolling Interest [Line Items] |
Additional contribution commitments to joint venture | $ 1,530
Hite |
Noncontrolling Interest [Line Items] |
Additional contribution commitments to joint venture | $ 1,470
Hite | Hite | Variable Interest Entity, primary beneficiary Belden |
Noncontrolling Interest [Line Items] |
Variable interest entity, ownership percentage | 51.00%

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- Definition Additional contribution commitments to joint venture. + References No definition available. + Details
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Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=bdc_HiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=bdc_HiteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |