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Quarterly Operating Results (Unaudited) - Additional Information (Detail) (USD $)	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
Quarterly Financial Information Disclosure [Abstract]
Severance and other restructuring costs	$ 22,000,000us-gaap_RestructuringCharges	$ 9,200,000us-gaap_RestructuringCharges	$ 38,200,000us-gaap_RestructuringCharges	$ 1,400,000us-gaap_RestructuringCharges	$ 5,400,000us-gaap_RestructuringCharges	$ 5,900,000us-gaap_RestructuringCharges	$ 7,700,000us-gaap_RestructuringCharges	$ 800,000us-gaap_RestructuringCharges	$ 70,827,000us-gaap_RestructuringCharges	$ 14,900,000us-gaap_RestructuringCharges
Purchase accounting effects related to acquisitions			7,400,000bdc_PurchaseAccountingAdjustment					6,600,000bdc_PurchaseAccountingAdjustment
Losses on the extinguishment of debt					$ 1,600,000					$ 1,612,000	$ 52,450,000

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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