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Segment Information Industry Segment Results (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 14, 2017
Segment Reporting Information [Line Items]
Number of divisions | segment									2
(Loss) Gain on Commodity Derivative Instruments									$ 376,105	$ (30,212)	$ 206,930
Other Operating Income									13,678	26,942	69,182
Total Revenue and Other Operating Income	$ 504,747	$ 526,681	$ 602,109	$ 275,234	$ 431,660	$ 393,223	$ 393,590	$ 485,019	1,922,449	1,730,434	1,455,131
Earnings (Loss) From Continuing Operations Before Income Tax									59,684	1,098,668	118,581
Segment Assets	9,060,806				8,592,170				9,060,806	8,592,170	6,931,913
Depreciation, Depletion and Amortization									508,463	493,423	412,036
Capital Expenditures									1,192,599	1,116,397	632,846
Equity in Earnings of Affiliates									2,103	5,363	49,830
Natural Gas, NGLs and Oil Sales
Segment Reporting Information [Line Items]
Revenue									1,364,325	1,577,937	1,125,224
Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue									94,027	65,986	53,795
Midstream Revenue
Segment Reporting Information [Line Items]
Revenue									74,314	89,781	0
Direct Energy Business Marketing LLC
Segment Reporting Information [Line Items]
Revenue									214,980	184,668	153,565
Total Revenue and Other Operating Income									214,980	184,668	153,656
NJR Energy Services Company
Segment Reporting Information [Line Items]
Revenue									147,540	219,472	147,595
Total Revenue and Other Operating Income									147,540	219,472	147,595
Operating Segments
Segment Reporting Information [Line Items]
Revenue									1,532,666	1,733,704	1,179,019
Earnings (Loss) From Continuing Operations Before Income Tax									26,211	378,427	(63,527)
Investments in Unconsolidated Equity Affiliates	16,710				18,663				16,710	18,663	197,921
Corporate, Non-Segment
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									0	0	0
Other Operating Income									0	0	0
Total Revenue and Other Operating Income									0	0	0
Earnings (Loss) From Continuing Operations Before Income Tax									33,473	720,241	182,108
Segment Assets	78,708				166,679				78,708	166,679	540,690
Depreciation, Depletion and Amortization									0	0	0
Capital Expenditures									0	0	0
Corporate, Non-Segment | Natural Gas, NGLs and Oil Sales
Segment Reporting Information [Line Items]
Revenue									0	0	0
Corporate, Non-Segment | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue									0	0	0
Corporate, Non-Segment | Midstream Revenue
Segment Reporting Information [Line Items]
Revenue									0	0
Intercompany Eliminations
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									0	0
Other Operating Income									(379)	(276)
Total Revenue and Other Operating Income									(233,089)	(168,569)
Earnings (Loss) From Continuing Operations Before Income Tax									0	0
Segment Assets	$ 6,331				(12,223)				6,331	(12,223)
Depreciation, Depletion and Amortization									0	0
Capital Expenditures									0	0
Intercompany Eliminations | Natural Gas, NGLs and Oil Sales
Segment Reporting Information [Line Items]
Revenue									0	0
Intercompany Eliminations | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue									0	0
Intercompany Eliminations | Midstream Revenue
Segment Reporting Information [Line Items]
Revenue									$ (232,710)	(168,293)
Variable Interest Entity, Primary Beneficiary
Segment Reporting Information [Line Items]
Variable interest entity, ownership percentage									34.00%
Total Revenue and Other Operating Income									$ 305,797	256,668
CNX Gathering
Segment Reporting Information [Line Items]
Interest in equity method investment	100.00%								100.00%			50.00%
Exploration and Production Equipment
Segment Reporting Information [Line Items]
Number of reportable segments | segment									4
Exploration and Production Equipment | Operating Segments
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									$ 376,105	(30,212)	206,930
Other Operating Income									14,057	27,218	69,182
Total Revenue and Other Operating Income									1,848,514	1,640,929	1,455,131
Earnings (Loss) From Continuing Operations Before Income Tax									(140,443)	244,616	(63,527)
Segment Assets	$ 6,745,091				6,518,597				6,745,091	6,518,597	6,391,223
Depreciation, Depletion and Amortization									474,352	461,149	412,036
Capital Expenditures									867,860	974,059	632,846
Exploration and Production Equipment | Operating Segments | Natural Gas, NGLs and Oil Sales
Segment Reporting Information [Line Items]
Revenue									1,364,325	1,577,937	1,125,224
Exploration and Production Equipment | Operating Segments | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue									94,027	65,986	53,795
Exploration and Production Equipment | Operating Segments | Midstream Revenue
Segment Reporting Information [Line Items]
Revenue									0	0
Midstream | Operating Segments
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									0	0
Other Operating Income									0	0
Total Revenue and Other Operating Income									307,024	258,074
Earnings (Loss) From Continuing Operations Before Income Tax									166,654	133,811	0
Segment Assets	$ 2,230,676				$ 1,919,117				2,230,676	1,919,117
Depreciation, Depletion and Amortization									34,111	32,274
Capital Expenditures									324,739	142,338
Midstream | Operating Segments | Natural Gas, NGLs and Oil Sales
Segment Reporting Information [Line Items]
Revenue									0	0
Midstream | Operating Segments | Purchased Gas Revenue
Segment Reporting Information [Line Items]
Revenue									0	0
Midstream | Operating Segments | Midstream Revenue
Segment Reporting Information [Line Items]
Revenue									307,024	258,074
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Marcellus Shale
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									47,475	(40,444)	(30,336)
Other Operating Income									0	0	0
Total Revenue and Other Operating Income									982,203	862,872	615,852
Earnings (Loss) From Continuing Operations Before Income Tax									234,284	254,310	91,436
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Utica Shale
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									14,943	(19,882)	1,367
Other Operating Income									0	0	0
Total Revenue and Other Operating Income									279,491	425,998	218,387
Earnings (Loss) From Continuing Operations Before Income Tax									87,972	194,164	64,741
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Coalbed Methane
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									7,335	(8,767)	(9,589)
Other Operating Income									0	0	0
Total Revenue and Other Operating Income									171,228	204,117	199,088
Earnings (Loss) From Continuing Operations Before Income Tax									35,170	49,719	20,346
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Other Gas
Segment Reporting Information [Line Items]
(Loss) Gain on Commodity Derivative Instruments									306,352	38,881	245,488
Other Operating Income									14,057	27,218	69,182
Total Revenue and Other Operating Income									415,592	147,942	421,804
Earnings (Loss) From Continuing Operations Before Income Tax									(497,869)	(253,577)	(240,050)
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Natural Gas, NGLs and Oil Sales | Marcellus Shale
Segment Reporting Information [Line Items]
Revenue									934,728	903,316	646,188
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Natural Gas, NGLs and Oil Sales | Utica Shale
Segment Reporting Information [Line Items]
Revenue									264,548	445,880	217,020
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Natural Gas, NGLs and Oil Sales | Coalbed Methane
Segment Reporting Information [Line Items]
Revenue									163,893	212,884	208,677
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Natural Gas, NGLs and Oil Sales | Other Gas
Segment Reporting Information [Line Items]
Revenue									1,156	15,857	53,339
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Purchased Gas Revenue | Marcellus Shale
Segment Reporting Information [Line Items]
Revenue									0	0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Purchased Gas Revenue | Utica Shale
Segment Reporting Information [Line Items]
Revenue									0	0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Purchased Gas Revenue | Coalbed Methane
Segment Reporting Information [Line Items]
Revenue									0	0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Purchased Gas Revenue | Other Gas
Segment Reporting Information [Line Items]
Revenue									94,027	65,986	$ 53,795
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Midstream Revenue | Marcellus Shale
Segment Reporting Information [Line Items]
Revenue									0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Midstream Revenue | Utica Shale
Segment Reporting Information [Line Items]
Revenue									0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Midstream Revenue | Coalbed Methane
Segment Reporting Information [Line Items]
Revenue									0	0
Reportable Subsegments | Exploration and Production Equipment | Operating Segments | Midstream Revenue | Other Gas
Segment Reporting Information [Line Items]
Revenue									$ 0	$ 0

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