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v2.3.0.15

Subsequent Event (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2011
Real and personal property as well as business interruption insurance | $ 300
Minimum [Member] |
Percentage of revenue generated by largest facility | 20.00%
Future capital expenditures | 20
Maximum [Member] |
Percentage of revenue generated by largest facility | 25.00%
Future capital expenditures | $ 25

X
- Definition Future Capital Expenditures + Details
Name: | bhe_FutureCapitalExpenditures
Namespace Prefix: | bhe
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of revenue generated by largest facility. + Details
Name: | bhe_PercentageOfRevenueGeneratedByLargestFacility
Namespace Prefix: | bhe
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Property and business interruption insurance. + Details
Name: | bhe_PropertyAndBusinessInterruptionInsurance
Namespace Prefix: | bhe
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration