Subsidiary Guarantors - Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash flows provided by (used in) operating activities:
Net income (loss) including noncontrolling interests	$ (878,864)	$ 42,168	$ 1,025,756	$ (77,972)	$ (67,275)	$ 80,810	$ 189,060	$ (64,437)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depletion, depreciation, amortization, and accretion							726,827	711,581
Impairment of oil and gas properties	1,041,469			221,094			1,253,712	406,068
Impairment of midstream assets	7,800			1,157			14,782	9,658
Commodity derivative fair value gains	(220,788)			(57,019)			(471,847)	(134,793)
Gains on settled commodity derivatives							261,794	268,369
Marketing derivative fair value (gains) losses	0			42			0	(94,081)
Gains on settled marketing derivatives								78,098
Deferred income tax expense							32,019	2,500
Gain on sale of assets							951
Equity-based compensation expense	3,875			16,202			19,327	56,429
Equity in earnings (loss) of unconsolidated affiliates	117,859			(10,705)			90,193	(27,832)
Distributions/dividends of earnings from unconsolidated affiliates							109,241	29,660
Gain on deconsolidation of Antero Midstream Partners LP							(1,406,042)
Other							8,179	2,945
Changes in current assets and liabilities							127,322	16,233
Net cash provided by operating activities							955,518	1,260,398
Cash flows provided by (used in) investing activities:
Additions to unproved properties							(69,796)	(130,381)
Drilling and completion costs							(957,931)	(1,125,660)
Additions to water handling and treatment systems							(24,416)	(77,385)
Additions to gathering systems and facilities							(48,239)	(337,448)
Additions to other property and equipment							(5,980)	(5,371)
Investments in unconsolidated affiliates							(25,020)	(91,419)
Proceeds from the Antero Midstream Partners LP Transactions							296,611
Change in other assets							7,461	(2,675)
Proceeds from sale of assets							1,983
Net cash used in investing activities							(825,327)	(1,770,339)
Cash flows provided by (used in) financing activities:
Repurchases of common stock							(17,924)
Issuance of senior notes							650,000
Borrowings (repayments) on bank credit facilities, net							(45,000)	682,000
Payments of deferred financing costs							(8,259)
Distributions to noncontrolling interests in Antero Midstream Partners LP							(85,076)	(188,775)
Employee tax withholding for settlement of equity compensation awards							(2,379)	(8,205)
Other							(2,021)	(3,520)
Net cash provided by financing activities							489,341	481,500
Effect of deconsolidation of Antero Midstream Partners LP							(619,532)
Net increase (decrease) in cash and cash equivalents								(28,441)
Cash and cash equivalents, beginning of period						28,441		28,441
Reportable legal entity | Parent (Antero)
Cash flows provided by (used in) operating activities:
Net income (loss) including noncontrolling interests				(154,419)			10,932	(275,971)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depletion, depreciation, amortization, and accretion							705,057	604,159
Accretion of contingent acquisition consideration								(11,841)
Impairment of oil and gas properties	1,041,469			221,094			1,253,712	406,068
Impairment of midstream assets	7,800						7,800	4,470
Commodity derivative fair value gains	(220,788)			(57,019)			(471,847)	(134,793)
Gains on settled commodity derivatives							261,794	268,369
Marketing derivative fair value (gains) losses				42				(94,081)
Gains on settled marketing derivatives								78,098
Deferred income tax expense							32,019	2,500
Gain on sale of assets							951
Equity-based compensation expense							16,850	39,823
Equity in earnings of consolidated subsidiaries				23,363			(15,021)	70,417
Equity in earnings (loss) of unconsolidated affiliates	38,255						33,255
Distributions/dividends of earnings from unconsolidated affiliates							96,636
Gain on deconsolidation of Antero Midstream Partners LP							(1,205,705)
Distributions from subsidiaries							94,391	115,678
Other							(40,493)	862
Changes in current assets and liabilities							121,087	20,015
Net cash provided by operating activities							901,418	1,093,773
Cash flows provided by (used in) investing activities:
Additions to unproved properties							(69,796)	(130,381)
Drilling and completion costs							(978,496)	(1,328,289)
Additions to gathering systems and facilities								175
Additions to other property and equipment							(4,918)	(5,371)
Proceeds from the Antero Midstream Partners LP Transactions							296,611
Change in other assets							10,818	(1,810)
Proceeds from sale of assets							1,983
Net cash used in investing activities							(743,798)	(1,465,676)
Cash flows provided by (used in) financing activities:
Repurchases of common stock							(17,924)
Borrowings (repayments) on bank credit facilities, net							(135,379)	362,000
Payments of deferred financing costs							(791)
Employee tax withholding for settlement of equity compensation awards							(2,350)	(6,806)
Other							(1,176)	(3,369)
Net cash provided by financing activities							(157,620)	351,825
Net increase (decrease) in cash and cash equivalents								(20,078)
Cash and cash equivalents, beginning of period						20,078		20,078
Reportable legal entity | Guarantor Subsidiaries
Cash flows provided by (used in) operating activities:
Net income (loss) including noncontrolling interests							131,135
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Equity in earnings (loss) of unconsolidated affiliates	$ 79,604						69,202
Gain on deconsolidation of Antero Midstream Partners LP							(200,337)
Reportable legal entity | Non-Guarantor Subsidiaries
Cash flows provided by (used in) operating activities:
Net income (loss) including noncontrolling interests				119,765			99,518	337,335
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depletion, depreciation, amortization, and accretion							21,770	107,422
Accretion of contingent acquisition consideration				4,020			1,928	11,841
Impairment of midstream assets				1,157			6,982	5,771
Gain on sale of assets								(583)
Equity-based compensation expense							2,477	16,606
Equity in earnings (loss) of unconsolidated affiliates				(10,705)			(12,264)	(27,832)
Distributions/dividends of earnings from unconsolidated affiliates							12,605	29,660
Other							750	2,083
Changes in current assets and liabilities							(10,573)	(10,901)
Net cash provided by operating activities							121,265	471,402
Cash flows provided by (used in) investing activities:
Additions to water handling and treatment systems							(24,547)	(68,325)
Additions to gathering systems and facilities							(48,239)	(337,623)
Additions to other property and equipment							(1,062)
Investments in unconsolidated affiliates							(25,020)	(91,419)
Change in other assets							(3,357)	(865)
Other								4,470
Net cash used in investing activities							(102,225)	(493,762)
Cash flows provided by (used in) financing activities:
Issuance of senior notes							650,000
Borrowings (repayments) on bank credit facilities, net							90,379	320,000
Payments of deferred financing costs							(7,468)
Distributions to noncontrolling interests in Antero Midstream Partners LP							(131,545)	(304,453)
Employee tax withholding for settlement of equity compensation awards							(29)	(1,399)
Other							(845)	(151)
Net cash provided by financing activities							600,492	13,997
Effect of deconsolidation of Antero Midstream Partners LP							(619,532)
Net increase (decrease) in cash and cash equivalents								(8,363)
Cash and cash equivalents, beginning of period						$ 8,363		8,363
Eliminations
Cash flows provided by (used in) operating activities:
Net income (loss) including noncontrolling interests				(43,318)			(52,525)	(125,801)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Accretion of contingent acquisition consideration				(4,020)			(1,928)	(11,841)
Impairment of midstream assets								(583)
Gain on sale of assets								583
Equity in earnings of consolidated subsidiaries				$ (23,363)			15,021	(70,417)
Distributions from subsidiaries							(94,391)	(115,678)
Other							47,922
Changes in current assets and liabilities							16,808	7,119
Net cash provided by operating activities							(67,165)	(304,777)
Cash flows provided by (used in) investing activities:
Drilling and completion costs							20,565	202,629
Additions to water handling and treatment systems							131	(9,060)
Other								(4,470)
Net cash used in investing activities							20,696	189,099
Cash flows provided by (used in) financing activities:
Distributions to noncontrolling interests in Antero Midstream Partners LP							46,469	115,678
Net cash provided by financing activities							$ 46,469	$ 115,678