Commitments and Contingencies (Details) (East Texas, USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
Jul. 31, 2009	Mar. 31, 2013	Mar. 31, 2012
East Texas
E. Texas Gathering System
Proceeds from gas gathering system, financing obligation	$ 18.4
Net book value of property	16.7
E. Texas gathering agreements, total cost incurred		$ 0.7	$ 0.9

Represents the net book value of the property, plant, and equipment associated with the financing obligation of the E. Texas gathering system.

No definition available.

Name:	bry_FinancingObligationPropertyPlantandEquipmentNet
Namespace Prefix:	bry_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant