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Thailand Flood-Related Items (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Thailand Flood Related Charges [Abstract] |  |  |
Thailand flood-related items, net of insurance | $ (1,571)bhe_FloodRelatedItemsNetOfInsurance | $ (41,325)bhe_FloodRelatedItemsNetOfInsurance | $ 9,028 bhe_FloodRelatedItemsNetOfInsurance

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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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- Details
Name: | us-gaap_ExtraordinaryAndUnusualItemsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration