Derivative Instruments and Hedging Activities (Details)	3 Months Ended
	Mar. 31, 2016 bbl / d MMBTU / d $ / bbl $ / MMBTU
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	[1]
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	[1]
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	[1]
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.