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Operating Segments and Geographic Information - Schedule of Revenues from External Customers and Long-Lived Assets Based on Physical Location (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 28, 2014	Jun. 29, 2014	Mar. 30, 2014	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 608,910us-gaap_SalesRevenueGoodsNet	$ 610,774us-gaap_SalesRevenueGoodsNet	$ 600,891us-gaap_SalesRevenueGoodsNet	$ 487,690us-gaap_SalesRevenueGoodsNet	$ 509,751us-gaap_SalesRevenueGoodsNet	$ 522,478us-gaap_SalesRevenueGoodsNet	$ 529,491us-gaap_SalesRevenueGoodsNet	$ 507,473us-gaap_SalesRevenueGoodsNet	$ 2,308,265us-gaap_SalesRevenueGoodsNet	$ 2,069,193us-gaap_SalesRevenueGoodsNet	$ 1,840,739us-gaap_SalesRevenueGoodsNet
Percent of total revenues									100.00%bdc_PercentageOfRevenues	100.00%bdc_PercentageOfRevenues	100.00%bdc_PercentageOfRevenues
Long-lived assets	403,359us-gaap_NoncurrentAssets				380,197us-gaap_NoncurrentAssets				403,359us-gaap_NoncurrentAssets	380,197us-gaap_NoncurrentAssets	371,050us-gaap_NoncurrentAssets
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,134,721us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US	1,032,190us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US	825,437us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_US
Percent of total revenues									49.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US	50.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US	45.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_US
Long-lived assets	191,728us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				170,813us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US				191,728us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	170,813us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US	164,619us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									194,149us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CA	195,387us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CA	196,761us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CA
Percent of total revenues									8.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CA	9.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CA	11.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CA
Long-lived assets	29,773us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA				27,458us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA				29,773us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	27,458us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA	31,610us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CA
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									132,330us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN	126,461us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN	193,082us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_CN
Percent of total revenues									6.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CN	6.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CN	10.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_CN
Long-lived assets	70,574us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CN				76,949us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CN				70,574us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CN	76,949us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CN	72,556us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_CN
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									120,297us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE	108,745us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE	105,377us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = country_DE
Percent of total revenues									5.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_DE	5.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_DE	6.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = country_DE
Long-lived assets	40,557us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE				45,702us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE				40,557us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE	45,702us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE	42,411us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_DE
All Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									726,768us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	606,410us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	520,082us-gaap_SalesRevenueGoodsNet / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember
Percent of total revenues									32.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	30.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	28.00%bdc_PercentageOfRevenues / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember
Long-lived assets	$ 70,727us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember				$ 59,275us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember				$ 70,727us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	$ 59,275us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember	$ 59,854us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = bdc_OtherCountryMember

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

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-Topic 280

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

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