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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Gain (loss) incurred in hedging activities.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Industry Segment Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Industry Segment Results (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	$ 18,005	$ 19,183	$ 78,752	$ 80,508
Other Operating Income	3,903	20,176	23,146	52,483
Total Revenue	397,126	287,185	1,294,979	978,180
Earnings (Loss) From Continuing Operations Before Income Tax	203,434	(11,266)	992,965	30,071
Segment Assets	8,209,036	8,979,568	8,209,036	8,979,568	$ 6,931,913
Depreciation, Depletion and Amortization	119,585	102,012	363,338	289,329
Capital Expenditures	297,465	149,500	794,124	399,462
Equity in earnings of unconsolidated affiliates			4,688	34,810	48,346
Investments in unconsolidated equity affiliates					$ 175,371	$ 169,208
NJR Energy Services Company [Member]
Segment Reporting Information [Line Items]
Total Revenue	42,901		158,746	110,548
Direct Energy Business Marketing LLC [Member]
Segment Reporting Information [Line Items]
Total Revenue		34,660		121,300
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	375,218	247,826	1,193,081	845,189
Earnings (Loss) From Continuing Operations Before Income Tax	85,604	(46,736)	290,868	(135,212)
Equity in earnings of unconsolidated affiliates	1,241	12,425	4,688	34,810
Investments in unconsolidated equity affiliates	19,488	190,154	19,488	190,154
Operating Segments [Member] \| Marcellus Shale [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	1,796	11,299	1,411	(42,911)
Other Operating Income	0	0	0	0
Total Revenue	209,203	145,091	592,139	434,480
Earnings (Loss) From Continuing Operations Before Income Tax	64,408	12,124	155,923	58,504
Operating Segments [Member] \| Utica Shale [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	(151)	2,517	746	(2,234)
Other Operating Income	0	0	0	0
Total Revenue	87,888	45,892	326,865	134,259
Earnings (Loss) From Continuing Operations Before Income Tax	41,237	7,341	143,830	34,211
Operating Segments [Member] \| Coalbed Methane [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	605	3,093	330	(12,894)
Other Operating Income	0	0	0	0
Total Revenue	49,076	49,837	153,184	144,450
Earnings (Loss) From Continuing Operations Before Income Tax	9,642	5,454	35,164	9,026
Operating Segments [Member] \| Other Gas [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	15,755	2,274	76,265	138,547
Other Operating Income	3,969	20,176	23,355	52,483
Total Revenue	31,079	46,365	153,316	264,991
Earnings (Loss) From Continuing Operations Before Income Tax	(60,856)	(71,655)	(138,551)	(236,953)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	0	0	0	0
Other Operating Income	0	0	0	0
Total Revenue	0	0	0	0
Earnings (Loss) From Continuing Operations Before Income Tax	117,830	35,470	702,097	165,283
Segment Assets	82,696	2,787,587	82,696	2,787,587
Depreciation, Depletion and Amortization	0	0	0	0
Capital Expenditures	0	0	0	0
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	0		0
Other Operating Income	(66)		(209)
Total Revenue	(41,492)		(117,400)
Earnings (Loss) From Continuing Operations Before Income Tax	0		0
Segment Assets	(12,926)	0	(12,926)	0
Depreciation, Depletion and Amortization	0		0
Capital Expenditures	0		0
E&P [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	18,005	19,183	78,752	80,508
Other Operating Income	3,969	20,176	23,355	52,483
Total Revenue	377,246	287,185	1,225,504	978,180
Earnings (Loss) From Continuing Operations Before Income Tax	54,431	(46,736)	196,366	(135,212)
Segment Assets	6,256,132	6,191,981	6,256,132	6,191,981
Depreciation, Depletion and Amortization	111,844	102,012	338,834	289,329
Capital Expenditures	253,263	149,500	708,660	399,462
CNXM [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Gain on Commodity Derivative Instruments	0		0
Other Operating Income	0		0
Total Revenue	61,372		186,875
Earnings (Loss) From Continuing Operations Before Income Tax	31,173	0	94,502	0
Segment Assets	1,883,134	0	1,883,134	0
Depreciation, Depletion and Amortization	7,741		24,504
Capital Expenditures	44,202		85,464
Oil and Gas [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	344,712	234,442	1,084,851	812,511
Oil and Gas [Member] \| Operating Segments [Member] \| Marcellus Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	207,407	133,792	590,728	477,391
Oil and Gas [Member] \| Operating Segments [Member] \| Utica Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	88,039	43,375	326,119	136,493
Oil and Gas [Member] \| Operating Segments [Member] \| Coalbed Methane [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	48,471	46,744	152,854	157,344
Oil and Gas [Member] \| Operating Segments [Member] \| Other Gas [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	795	10,531	15,150	41,283
Oil and Gas [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Oil and Gas [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Oil and Gas [Member] \| E&P [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	344,712	234,442	1,084,851	812,511
Oil and Gas [Member] \| CNXM [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Purchased Gas Revenue [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	10,560	13,384	38,546	32,678
Purchased Gas Revenue [Member] \| Operating Segments [Member] \| Marcellus Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Purchased Gas Revenue [Member] \| Operating Segments [Member] \| Utica Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Purchased Gas Revenue [Member] \| Operating Segments [Member] \| Coalbed Methane [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0	0		0
Purchased Gas Revenue [Member] \| Operating Segments [Member] \| Other Gas [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	10,560	13,384	38,546	32,678
Purchased Gas Revenue [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0	0	0	0
Purchased Gas Revenue [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Purchased Gas Revenue [Member] \| E&P [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	10,560	13,384	38,546	32,678
Purchased Gas Revenue [Member] \| CNXM [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	19,946	$ 0	69,684	$ 0
Midstream Revenue [Member] \| Operating Segments [Member] \| Marcellus Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| Operating Segments [Member] \| Utica Shale [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| Operating Segments [Member] \| Coalbed Methane [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| Operating Segments [Member] \| Other Gas [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	(41,426)		(117,191)
Midstream Revenue [Member] \| E&P [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	0		0
Midstream Revenue [Member] \| CNXM [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue from Contracts with Customers	$ 61,372		$ 186,875