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Intangible Assets - Changes in Carrying Amount of Indefinite-Lived Trademarks (Detail) (Trademarks [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance | $ 103,347 | $ 40,635 |
Reclass to definite-lived | (6,777) |  |
Impairment | 0 | (5,239) | 0
Acquisitions and purchase accounting adjustments | (4,918) | 67,554 |
Translation impact | 358 | 397 |
Trademarks, Ending Balance | 92,010 | 103,347 | 40,635
Broadcast Solutions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance | 80,310 | 12,187 |
Reclass to definite-lived | (5,424) |  |
Impairment |  |  |
Acquisitions and purchase accounting adjustments | (4,918) | 67,554 |
Translation impact | 159 | 569 |
Trademarks, Ending Balance | 70,127 | 80,310 |
Enterprise Connectivity Solutions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance | 1,299 | 1,284 |
Reclass to definite-lived | (1,353) |  |
Impairment |  |  |
Acquisitions and purchase accounting adjustments |  |  |
Translation impact | 54 | 15 |
Trademarks, Ending Balance |  | 1,299 |
Industrial Connectivity Solutions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance | 12,279 | 12,545 |
Reclass to definite-lived |  |  |
Impairment |  |  |
Acquisitions and purchase accounting adjustments |  |  |
Translation impact | (86) | (266) |
Trademarks, Ending Balance | 12,193 | 12,279 |
Industrial IT Solutions [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance | 9,459 | 9,396 |
Reclass to definite-lived |  |  |
Impairment |  |  |
Acquisitions and purchase accounting adjustments |  |  |
Translation impact | 231 | 63 |
Trademarks, Ending Balance | 9,690 | 9,459 |
All Other [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Trademarks, Beginning Balance |  | 5,223 |
Reclass to definite-lived |  |  |
Impairment |  | (5,239) |
Acquisitions and purchase accounting adjustments |  |  |
Translation impact |  | 16 |
Trademarks, Ending Balance |  |  |

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- Definition Reclassification From Indefinite Lived Intangible Assets To Definite Lived Assets Trademarks + References No definition available. + Details
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Namespace Prefix: | bdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase (decrease) of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit, from foreign currency translation and purchase accounting adjustments. + References No definition available. + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trademark to gain or protect exclusive use of a business name, symbol or other device or style for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_IndefiniteLivedTrademarks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant