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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