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Thailand Flood-Related Items (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Thailand Flood Related Charges [Abstract] |  |  |
Thailand flood-related items, net of insurance | $ 0 | $ (1,571) | $ (41,325)

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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

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- References No definition available. + Details
Name: | us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration