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Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 778,708	$ 336,591
Reassignment of goodwill
Acquisitions and purchase accounting adjustments	4,986	439,696
Translation impact	(10,646)	2,421
Goodwill, Ending Balance	773,048	778,708
Americas [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	690,578	249,319
Reassignment of goodwill	(690,578)
Acquisitions and purchase accounting adjustments		439,696
Translation impact		1,563
Goodwill, Ending Balance		690,578
EMEA [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	70,328	69,470
Reassignment of goodwill	(70,328)
Acquisitions and purchase accounting adjustments
Translation impact		858
Goodwill, Ending Balance		70,328
Asia Pacific [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	17,802	17,802
Reassignment of goodwill	(17,802)
Acquisitions and purchase accounting adjustments
Translation impact
Goodwill, Ending Balance		17,802
Broadcast Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Reassignment of goodwill	473,029
Acquisitions and purchase accounting adjustments	4,986
Translation impact	(11,640)
Goodwill, Ending Balance	466,375
Enterprise Connectivity Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Reassignment of goodwill	50,136
Acquisitions and purchase accounting adjustments
Translation impact
Goodwill, Ending Balance	50,136
Industrial Connectivity Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Reassignment of goodwill	188,201
Acquisitions and purchase accounting adjustments
Translation impact	(226)
Goodwill, Ending Balance	187,975
Industrial IT Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance
Reassignment of goodwill	67,342
Acquisitions and purchase accounting adjustments
Translation impact	1,220
Goodwill, Ending Balance	$ 68,562

X

- Definition

Business Acquisition Purchase Price Allocations Goodwill Amount

+ References

No definition available.

+ Details

Name:	bdc_BusinessAcquisitionPurchasePriceAllocationsGoodwillAmount
Namespace Prefix:	bdc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_GoodwillLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of transfers of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized among segments.

+ References

No definition available.

+ Details

Name:	us-gaap_GoodwillTransfers
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration