|**Derivative Instruments and Hedging Activities (Details)**                                                                                  | 3 Months Ended                                                                                                   
|-------------------------------------------------------------------------------------------------------------------------------------------- | -----------------------------------------------------------------------------------------------------------------
|
|Crude Oil Commodity Contract | Swaps - Dated Brent Extension [Member]                                                                        |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 3,000                                                                                                            
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 62.80                                                                                                            
|Crude Oil Commodity Contract | Swaps - NYMEX WTI Extension [Member]                                                                          |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 4,000                                                                                                            
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 47.34                                                                                                            
|Crude Oil Commodity Contract | Swaps - NYMEX WTI Increase [Member]                                                                           |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 4,000                                                                                                            
|Crude Oil Commodity Contract | Swaps - Dated Brent Increase [Member]                                                                         |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 3,000                                                                                                            
|Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016                                                                                        |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 12,000                                                                                                           
|Weighted Average Fixed Price                                                                                                                 | 74.47                                                                                                            
|Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2016 [Member]                                                                     |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 1,000                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 60.00                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 70.00                                                                                                            
|Crude Oil Commodity Contract | Swaps - Dated Brent 2016                                                                                      |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | Dated Brent                                                                                                      
|Bbls Per Day | bbl / d                                                                                                                       | 9,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 97.96                                                                                                            
|Crude Oil Commodity Contract | Three Way Collars - NYMEX WTI 2016                                                                            |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 6,000                                                                                                            
|Weighted Average Short Put Price                                                                                                             | 61.00                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 72.50                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 86.37                                                                                                            
|Crude Oil Commodity Contract | Three Way Collars - Dated Brent 2016                                                                          |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | Dated Brent                                                                                                      
|Bbls Per Day | bbl / d                                                                                                                       | 8,000                                                                                                            
|Weighted Average Short Put Price                                                                                                             | 72.50                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 86.25                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 101.79                                                                                                           
|Crude Oil Commodity Contract | Call - NYMEX WTI 2017 [Member]                                                                                |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2017                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 3,000                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 57.00                                                                                                            
|Crude Oil Commodity Contract | Swaps - NYMEX WTI 2017 [Member]                                                                               |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2017                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 4,000                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 47.34                                                                                                            
|Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2017 [Member]                                                                     |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2017                                                                                                             
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 7,000                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 40.00                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 53.29                                                                                                            
|Natural Gas Commodity Contract | Swaps - NYMEX HH 2016                                                                                       |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX HH                                                                                                         
|Bbls Per Day | MMBTU / d                                                                                                                     | 40,000                                                                                                           
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 3.60                                                                                                             
|Natural Gas Commodity Contract | Two Way Collars - NYMEX HH 2016                                                                             |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX HH                                                                                                         
|Bbls Per Day | MMBTU / d                                                                                                                     | 30,000                                                                                                           
|Weighted Average Floor Price | $ / MMBTU                                                                                                     | 3.00                                                                                                             
|Weighted Average Ceiling Price | $ / MMBTU                                                                                                   | 3.50                                                                                                             
|Natural Gas Commodity Contract | Three Way Collars - NYMEX HH 2016 [Member]                                                                  |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | NYMEX HH                                                                                                         
|Bbls Per Day | MMBTU / d                                                                                                                     | 90,000                                                                                                           
|Weighted Average Short Put Price | $ / MMBTU                                                                                                 | 2.83                                                                                                             
|Weighted Average Floor Price | $ / MMBTU                                                                                                     | 3.42                                                                                                             
|Weighted Average Ceiling Price | $ / MMBTU                                                                                                   | 3.90                                                                                                             
|Natural Gas Commodity Contract | Swaps - NYMEX HH 2017 [Member]                                                                              |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2017                                                                                                             
|Index                                                                                                                                        | NYMEX HH                                                                                                         
|Bbls Per Day | MMBTU / d                                                                                                                     | 60,000                                                                                                           
|Weighted Average Ceiling Price | $ / MMBTU                                                                                                   | 3.14                                                                                                             
|Natural Gas Commodity Contract | Swaps - NYMEX HH Extension                                                                                  |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 60,000                                                                                                           
|Natural Gas Commodity Contract | Swaps - NYMEX HH Increase                                                                                   |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Bbls Per Day | MMBTU / d                                                                                                                     | 60,000                                                                                                           
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 3.14                                                                                                             
|Rosetta Resources, Inc [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016                                                      |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | (4)                                                                                                              
|Bbls Per Day | bbl / d                                                                                                                       | 6,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 90.28                                                                                                            
|Rosetta Resources, Inc [Member] | Natural Gas Commodity Contract | Swaps - Houston Ship Channel and Tennessee Zone 0 2016 [Member] [Member]  |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | (2)                                                                                                              
|Bbls Per Day | MMBTU / d                                                                                                                     | 30,000                                                                                                           
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 4.04                                                                                                             
|Rosetta Resources, Inc [Member] | Natural Gas Commodity Contract | Two Way Collars - Houston Ship Channel and Tennessee Zone 0 2016 [Member] |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2016                                                                                                             
|Index                                                                                                                                        | (2)                                                                                                              
|Bbls Per Day | MMBTU / d                                                                                                                     | 30,000                                                                                                           
|Weighted Average Floor Price | $ / MMBTU                                                                                                     | 3.50                                                                                                             
|Weighted Average Ceiling Price | $ / MMBTU                                                                                                   | 5.60                                                                                                             
|Second half 2017 [Member] | Crude Oil Commodity Contract | Call - NYMEX WTI 2017 [Member]                                                    |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H17 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 3,000                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 60.12                                                                                                            
|Second half 2017 [Member] | Crude Oil Commodity Contract | Swaps - Dated Brent 2017 [Member]                                                 |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H17 (1)                                                                                                         
|Index                                                                                                                                        | Dated Brent                                                                                                      
|Bbls Per Day | bbl / d                                                                                                                       | 3,000                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 62.80                                                                                                            
|Second Quarter 2016 [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016                                                         |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2Q16 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 5,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 54.16                                                                                                            
|Second half 2016 [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016                                                            |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H16 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 4,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 47.34                                                                                                            
|Second half 2016 [Member] | Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2016 [Member]                                         |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H16 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 6,000                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 35.00                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 49.82                                                                                                            
|Second half 2016 [Member] | Crude Oil Commodity Contract | Call - NYMEX WTI 2016 [Member]                                                    |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H16 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 5,000                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 54.16                                                                                                            
|Second half 2016 [Member] | Natural Gas Commodity Contract | Swaps - NYMEX HH 2016                                                           |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 2H16                                                                                                             
|Index                                                                                                                                        | NYMEX HH                                                                                                         
|Bbls Per Day | MMBTU / d                                                                                                                     | 30,000                                                                                                           
|Weighted Average Fixed Price | $ / MMBTU                                                                                                     | 2.77                                                                                                             
|First half 2017 [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2017 [Member]                                                    |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 1H17 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 3,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 60.12                                                                                                            
|First half 2017 [Member] | Crude Oil Commodity Contract | Swaps - Dated Brent 2017 [Member]                                                  |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 1H17 (1)                                                                                                         
|Index                                                                                                                                        | Dated Brent                                                                                                      
|Bbls Per Day | bbl / d                                                                                                                       | 3,000                                                                                                            
|Weighted Average Fixed Price                                                                                                                 | 62.80                                                                                                            
|First half 2017 [Member] | Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2017 [Member]                                          |                                                                                                                  
|**Derivative [Line Items]**                                                                                                                  |                                                                                                                  
|Settlement Period                                                                                                                            | 1H17 (1)                                                                                                         
|Index                                                                                                                                        | NYMEX WTI                                                                                                        
|Bbls Per Day | bbl / d                                                                                                                       | 2,000                                                                                                            
|Weighted Average Floor Price                                                                                                                 | 40.00                                                                                                            
|Weighted Average Ceiling Price                                                                                                               | 50.44                                                                                                            
|                                                                                                                                            
|[1]
Includes derivative instruments assumed by our subsidiary, NBL Texas, LLC, in connection with the Rosetta Merger.                        | [1]                                                                                                              
|[1]                                                                                                                                          | Includes derivative instruments assumed by our subsidiary, NBL Texas, LLC, in connection with the Rosetta Merger.

X- DefinitionAggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.
+ ReferencesReference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B
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