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Intangible Assets - Carrying Value of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Intangible Assets [Line Items] |  |  |
Intangible assets, Gross carrying amount | $ 626,836 us-gaap_IntangibleAssetsGrossExcludingGoodwill | $ 491,768 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Finite-lived intangible assets, Gross Carrying Amount | 515,115 us-gaap_FiniteLivedIntangibleAssetsGross | 394,762 us-gaap_FiniteLivedIntangibleAssetsGross |
Finite-lived intangible assets, Accumulated amortization | (165,544)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (114,792)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible assets, Net carrying amount | 461,292 us-gaap_IntangibleAssetsNetExcludingGoodwill | 376,976 us-gaap_IntangibleAssetsNetExcludingGoodwill | 428,273 us-gaap_IntangibleAssetsNetExcludingGoodwill
Finite-lived intangible assets, Net carrying amount | 349,571 us-gaap_FiniteLivedIntangibleAssetsNet | 279,970 us-gaap_FiniteLivedIntangibleAssetsNet |
Goodwill, Gross carrying amount | 943,374 us-gaap_GoodwillGross | 773,048 us-gaap_GoodwillGross |
Goodwill, Accumulated amortization | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Goodwill, Net carrying amount | 943,374 us-gaap_Goodwill | 773,048 us-gaap_Goodwill | 778,708 us-gaap_Goodwill
Indefinite-Lived Trademarks Not Subject to Amortization [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, Carrying amount | 111,721 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 97,006 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite lived intangible assets, Accumulated amortization | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite-lived intangible assets, Carrying amount | 111,721 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 97,006 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Trademarks [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 19,438 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 7,151 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Finite-lived intangible assets, Accumulated amortization | (3,687)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | (1,033)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Finite-lived intangible assets, Net carrying amount | 15,751 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember | 6,118 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember |
Trademarks [Member] | Indefinite-Lived Trademarks Not Subject to Amortization [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, Carrying amount | 103,040 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 92,010 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite lived intangible assets, Accumulated amortization | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite-lived intangible assets, Carrying amount | 103,040 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 92,010 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
In-Process/Service Research and Development [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 10,340 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 6,549 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Finite-lived intangible assets, Accumulated amortization | (2,777)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | (1,124)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
Finite-lived intangible assets, Net carrying amount | 7,563 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember | 5,425 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember |
In-Process/Service Research and Development [Member] | Indefinite-Lived Trademarks Not Subject to Amortization [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets, Carrying amount | 8,681 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 4,996 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite lived intangible assets, Accumulated amortization | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 0 bdc_IndefiniteLivedIntangibleAssetsExcludingGoodwillAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Indefinite-lived intangible assets, Carrying amount | 8,681 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember | 4,996 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_InProcessResearchAndDevelopmentMember / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = bdc_IntangibleAssetsNotSubjectToAmortizationMember |
Customer Relationships [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 261,914 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 198,522 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Finite-lived intangible assets, Accumulated amortization | (46,457)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (35,981)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Finite-lived intangible assets, Net carrying amount | 215,457 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 162,541 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Developed Technology [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 213,017 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 174,106 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-lived intangible assets, Accumulated amortization | (102,996)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | (68,233)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-lived intangible assets, Net carrying amount | 110,021 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember | 105,873 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Backlog [Member] |  |  |
Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, Gross Carrying Amount | 10,406 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember | 8,434 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |
Finite-lived intangible assets, Accumulated amortization | (9,627)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember | (8,421)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |
Finite-lived intangible assets, Net carrying amount | $ 779 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember | $ 13 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = bdc_BacklogMember |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- 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=35741047&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
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- Definition Amount before 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of accumulated impairment loss for 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 (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having 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
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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