Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss) including noncontrolling interest	$ 675,835	$ (18,930)	$ (285,069)
Adjustment to reconcile net income to net cash provided by operating activities:
Depletion, depreciation, amortization, and accretion	479,167	234,941	102,127
Impairment of unproved properties	15,198	10,928	12,070
Derivative fair value gains	(868,201)	(491,689)	(179,546)
Cash receipts for settled derivatives	135,784	163,570	178,491
Deferred income taxes expense	445,672	190,210	106,229
Gain on sale of assets	(40,000)		(291,190)
Equity based compensation	112,252	365,280
Loss on early extinguishment of debt	20,386	42,567
Loss (gain) on sale of discontinued operations	(3,564)	(8,506)	795,945
Depletion, depreciation, amortization, and impairment of unproved properties - discontinued operations			90,096
Derivative fair value gains - discontinued operations			(46,358)
Cash receipts for settled derivatives - discontinued operations			92,166
Deferred income tax benefit (expense)—discontinued operations	1,354	3,249	(272,553)
Other	6,433	1,173	4,960
Changes in assets and liabilities:
Accounts receivable	(45,593)	(9,314)	5,511
Accrued revenue	(94,733)	(50,156)	(10,683)
Other current assets	(2,891)	19,543	(8,882)
Accounts payable	(11,710)	1,039	(2,117)
Accrued liabilities	85,953	26,803	14,790
Revenue distributions payable	85,763	50,552	11,268
Other	1,016	3,447	15,000
Net cash provided by operating activities	998,121	534,707	332,255
Cash flows used in investing activities:
Additions to proved properties	(64,066)	(15,300)	(10,254)
Additions to unproved properties	(777,422)	(440,825)	(687,403)
Drilling and completion costs	(2,477,150)	(1,615,965)	(836,350)
Additions to fresh water distribution systems	(196,675)	(203,790)	(2,801)
Additions to gathering systems and facilities	(558,037)	(389,453)	(142,294)
Additions to other property and equipment	(13,218)	(6,240)	(3,447)
Decrease in notes receivable	2,667	4,555	4,889
Change in other assets	(5,749)	(6,574)	(3,707)
Proceeds from asset sales			1,217,876
Net cash used in investing activities	(4,089,650)	(2,673,592)	(463,491)
Cash flows from financing activities:
Issuance of common stock		1,578,573
Issuance of common units in Antero Midstream Partners LP	1,087,224
Issuance of senior notes	1,102,500	1,231,750	300,000
Repayment of senior notes	(260,000)	(690,000)
Borrowings (repayments) on bank credit facility, net	1,442,000	71,000	(148,000)
Make-whole premium on debt extinguished	(17,383)	(33,041)
Payments of deferred financing costs	(31,543)	(20,899)	(5,926)
Other	(2,777)		808
Net cash provided by financing activities	3,320,021	2,137,383	146,882
Net increase (decrease) in cash and cash equivalents	228,492	(1,502)	15,646
Cash and cash equivalents, beginning of period	17,487	18,989	3,343
Cash and cash equivalents, end of period	245,979	17,487	18,989
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	163,055	117,832	90,122
Supplemental disclosure of noncash investing activities:
Increase in accounts payable for additions to property and equipment	$ 181,591	$ 188,123	$ 72,881