Net Revenues and Other Financial Information by Business Segment (Parenthetical) (Detail) (USD $)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Corporate assets (including cash and cash equivalents)	$ 304.6	$ 123.8	$ 144.6

Corporate Asset Including Cash and Cash Equivalent

No definition available.

Name:	beav_CorporateAssetIncludingCashAndCashEquivalent
Namespace Prefix:	beav_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant