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Derivative Instruments and Hedging Activities (Details)
 9 Months Ended
Sep. 30, 2015
bbl / d
MMBTU / d
$ / bbl
$ / MMBTU
Crude Oil Commodity Contract | Swaps - NYMEX WTI 2015  
Derivative [Line Items]  
Settlement Period 2015
Index NYMEX WTI
Bbls Per Day | bbl / d 27,000
Weighted Average Fixed Price 88.80
Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2015  
Derivative [Line Items]  
Settlement Period 2015
Index NYMEX WTI
Bbls Per Day | bbl / d 5,000
Weighted Average Floor Price 50.00
Weighted Average Ceiling Price 64.94
Crude Oil Commodity Contract | Swaps - Dated Brent 2015  
Derivative [Line Items]  
Settlement Period 2015
Index Dated Brent
Bbls Per Day | bbl / d 8,000
Weighted Average Fixed Price 100.31
Crude Oil Commodity Contract | Three Way Collars - NYMEX WTI 2015  
Derivative [Line Items]  
Settlement Period 2015
Index NYMEX WTI
Bbls Per Day | bbl / d 20,000
Weighted Average Short Put Price 70.50
Weighted Average Floor Price 87.55
Weighted Average Ceiling Price 94.41
Crude Oil Commodity Contract | Three Way Collars - Dated Brent 2015  
Derivative [Line Items]  
Settlement Period 2015
Index Dated Brent
Bbls Per Day | bbl / d 13,000
Weighted Average Short Put Price 76.92
Weighted Average Floor Price 96.00
Weighted Average Ceiling Price 108.49
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 | Two Way Collars - NYMEX HH 2016  
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
Natural Gas Commodity Contract | Swaps - NYMEX HH 2015  
Derivative [Line Items]  
Settlement Period 2015
Index NYMEX HH
Bbls Per Day | MMBTU / d 140,000
Weighted Average Fixed Price | $ / MMBTU 4.30
Natural Gas Commodity Contract | Three Way Collars - NYMEX HH 2015  
Derivative [Line Items]  
Settlement Period 2015
Index NYMEX HH
Bbls Per Day | MMBTU / d 150,000
Weighted Average Short Put Price | $ / MMBTU 3.58
Weighted Average Floor Price | $ / MMBTU 4.25
Weighted Average Ceiling Price | $ / MMBTU 5.04
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  
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 Extension  
Derivative [Line Items]  
Bbls Per Day | MMBTU / d 30,000
Natural Gas Commodity Contract | Swaps - NYMEX HH Increase  
Derivative [Line Items]  
Bbls Per Day | MMBTU / d 30,000
Weighted Average Fixed Price | $ / MMBTU 3.50 [1]
Rosetta Resources, Inc [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2015  
Derivative [Line Items]  
Settlement Period 2015
Index (2)
Bbls Per Day | bbl / d 12,000
Weighted Average Fixed Price 89.81
Rosetta Resources, Inc [Member] | Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2015  
Derivative [Line Items]  
Settlement Period 2015
Index (2)
Bbls Per Day | bbl / d 8,000
Weighted Average Floor Price 55.00
Weighted Average Ceiling Price 84.80
Rosetta Resources, Inc [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016  
Derivative [Line Items]  
Settlement Period 2016
Index (2)
Bbls Per Day | bbl / d 6,000
Weighted Average Fixed Price 90.28
Rosetta Resources, Inc [Member] | NGL Commodity Contract | Swaps - NGL Ethane  
Derivative [Line Items]  
Settlement Period 2015
Index NGL-Ethane
Bbls Per Day | bbl / d 104,000
Weighted Average Fixed Price 0.27
Rosetta Resources, Inc [Member] | NGL Commodity Contract | Swaps - NGL Propane  
Derivative [Line Items]  
Settlement Period 2015
Index NGL-Propane
Bbls Per Day | bbl / d 73,500
Weighted Average Fixed Price 1.03
Rosetta Resources, Inc [Member] | NGL Commodity Contract | Swaps - NGL Isobutane  
Derivative [Line Items]  
Settlement Period 2015
Index NGL-Isobutane
Bbls Per Day | bbl / d 25,900
Weighted Average Fixed Price 1.26
Rosetta Resources, Inc [Member] | NGL Commodity Contract | Swaps - NGL Normal Butane  
Derivative [Line Items]  
Settlement Period 2015
Index NGL-Normal Butane
Bbls Per Day | bbl / d 24,300
Weighted Average Fixed Price 1.25
Rosetta Resources, Inc [Member] | NGL Commodity Contract | Swaps - NGL Pentanes Plus  
Derivative [Line Items]  
Settlement Period 2015
Index NGL-Pentanes Plus
Bbls Per Day | bbl / d 24,300
Weighted Average Fixed Price 1.85
Rosetta Resources, Inc [Member] | Natural Gas Commodity Contract | Swaps - Houston Ship Channel and Tennessee Zone 0 2015 [Member]  
Derivative [Line Items]  
Settlement Period 2015
Index (2)
Bbls Per Day | MMBTU / d 50,000
Weighted Average Fixed Price | $ / MMBTU 4.13
Rosetta Resources, Inc [Member] | Natural Gas Commodity Contract | Two Way Collars - Houston Ship Channel and Tennessee Zone 0 2015 [Member]  
Derivative [Line Items]  
Settlement Period 2015
Index (2)
Bbls Per Day | MMBTU / d 50,000
Weighted Average Floor Price | $ / MMBTU 3.60
Weighted Average Ceiling Price | $ / MMBTU 5.04
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
First half 2016 [Member] | Swaps - NYMEX WTI 2016  
Derivative [Line Items]  
Bbls Per Day | bbl / d 3,000
First half 2016 [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016  
Derivative [Line Items]  
Settlement Period 1H16 (4)
Index NYMEX WTI
Bbls Per Day | bbl / d 15,000
Weighted Average Fixed Price 70.31
Second half 2016 [Member] | Crude Oil Commodity Contract | Swaps - NYMEX WTI 2016  
Derivative [Line Items]  
Settlement Period 2H16 (4)
Index NYMEX WTI
Bbls Per Day | bbl / d 12,000
Weighted Average Fixed Price 74.47
Second half 2016 [Member] | Crude Oil Commodity Contract | Call - NYMEX WTI 2016 [Member]  
Derivative [Line Items]  
Settlement Period 2H16 (4)
Index NYMEX WTI
Bbls Per Day | bbl / d 3,000
Weighted Average Ceiling Price 53.65
[1] Includes derivative instruments assumed by our subsidiary, NBL Texas, LLC, in connection with the Rosetta Merger.