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Supplemental Oil & Natural Gas Data (Unaudited) Standardized Measure of Discounted Future Net Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 17, 2013
Dec. 16, 2013
Dec. 31, 2012
Dec. 31, 2011
Successor            
Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves            
Future estimated revenues $ 16,844,678us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 $ 17,863,984us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
Future estimated production costs (7,742,035)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 (6,654,536)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
Future estimated development costs (1,132,807)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 (1,854,849)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
Future estimated income tax expense 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 0us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
Future net cash flows 7,969,836us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 9,354,599us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
10% annual discount for estimated timing of cash flows (3,639,459)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 (4,719,267)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		        
Standardized measure of discounted future net cash flows 4,330,377us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 4,635,332us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 3,558,595us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		      
Successor | Crude Oil [Member]            
Representative NYMEX prices: (1)            
Oil (Bbl) 95.27bry_RepresentativeNYMEXoilprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 [1] 96.89bry_RepresentativeNYMEXoilprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 [1]        
Successor | Natural gas ($/Mcf)            
Representative NYMEX prices: (1)            
Natural gas (MMBtu) 4.35bry_RepresentativeNYMEXnaturalgasprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasPerThousandCubicFeetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 [1] 3.67bry_RepresentativeNYMEXnaturalgasprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasPerThousandCubicFeetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_SuccessorMember		 [1]        
Predecessor            
Discounted Future Net Cash Flows Relating to Proved Oil and Natural Gas Reserves            
Future estimated revenues         19,738,729us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesCashInflows
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Future estimated production costs         (5,884,891)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesProductionCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Future estimated development costs         (2,164,780)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesDevelopmentCosts
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Future estimated income tax expense         (3,344,024)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesIncomeTaxExpense
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Future net cash flows         8,345,034us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesNetCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
10% annual discount for estimated timing of cash flows         (4,511,619)us-gaap_FutureNetCashFlowsRelatingToProvedOilAndGasReservesTenPercentAnnualDiscountForEstimatedTimingOfCashFlows
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		  
Standardized measure of discounted future net cash flows       $ 3,558,595us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 3,833,415us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 $ 4,035,279us-gaap_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReserves
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Predecessor | Crude Oil [Member]            
Representative NYMEX prices: (1)            
Oil (Bbl)         90.66bry_RepresentativeNYMEXoilprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_CrudeOilMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [1]  
Predecessor | Natural gas ($/Mcf)            
Representative NYMEX prices: (1)            
Natural gas (MMBtu)         2.88bry_RepresentativeNYMEXnaturalgasprice
/ us-gaap_AverageSalesPriceAndProductionCostsPerUnitOfProductionProductionTypeAxis
= us-gaap_NaturalGasPerThousandCubicFeetMember
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember		 [1]  
[1] In accordance with SEC regulations, reserves were estimated using the average price during the 12-month period, determined as an unweighted average of the first-day-of-the-month price for each month, excluding escalations based upon future conditions. The average price used to estimate reserves is held constant over the life of the reserves.