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Thailand Flood Related Items (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Thailand flood related items, net of insurance | $ 0 | $ (9,748) | $ (1,571) | $ (9,748)

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- Definition Flood Related Items, Net Of Insurance + References No definition available. + Details
Name: | bhe_FloodRelatedItemsNetOfInsurance
Namespace Prefix: | bhe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration