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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Unrecognized compensation cost related to all nonvested awards | $ 18.9 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Unrecognized compensation cost is expected to be recognized over a weighted-average period | 1 year 9 months 18 days
SARs and Stock Options [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
SAR's and stock options expiration period | 10 years
Restricted Shares and Units [Member] | Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Restricted Shares and Units [Member] | Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 5 years
Performance Conditions One Member [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of restricted stock units issued on second anniversary | 50.00%bdc_PercentageOfRestrictedStockUnitsIssuedOnSecondAnniversary / us-gaap_VestingAxis = bdc_PerformanceConditionsOneMemberMember
Percentage of restricted stock units issued on third anniversary | 50.00%bdc_PercentageOfRestrictedStockUnitsIssuedOnThirdAnniversary / us-gaap_VestingAxis = bdc_PerformanceConditionsOneMemberMember
Performance Conditions Two Member [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percentage of restricted stock units issued on third anniversary | 100.00%bdc_PercentageOfRestrictedStockUnitsIssuedOnThirdAnniversary / us-gaap_VestingAxis = bdc_PerformanceConditionsTwoMemberMember

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- Definition Percentage of restricted stock units issued on second anniversary. + References No definition available. + Details
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- Definition Percentage of restricted stock units issued on third anniversary. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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