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Share Repurchases - Additional Information (Detail) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended			42 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Nov. 30, 2012	Jul. 31, 2011
Equity, Class of Treasury Stock [Line Items]
Purchase of common stock					$ 200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 150,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Payments under share repurchase program	92,197,000us-gaap_PaymentsForRepurchaseOfCommonStock	93,750,000us-gaap_PaymentsForRepurchaseOfCommonStock	75,000,000us-gaap_PaymentsForRepurchaseOfCommonStock
Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Payments under share repurchase program	$ 92,200,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 93,800,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 75,000,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 310,900,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember
Repurchase of shares	1,300us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	1,700us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	2,100us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	6,700us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember
Repurchase of shares average price per share	$ 73.06us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 54.76us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 36.20us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember	$ 46.54us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = bdc_ShareRepurchaseProgramMember

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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