Equity Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		10 Months Ended	12 Months Ended
	Mar. 12, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019
Additional disclosures
Expense recognized		$ 4,900	$ 73,517
Unamortized expense		0	0
Common Stock
Additional disclosures
Shares exchanged	5,782,601
Antero Resources
Additional disclosures
Unamortized expense						$ 26,000
Midstream LTIP
Additional disclosures
Unamortized expense		$ 13,000	$ 13,000
Weighted average period for recognizing unrecognized stock-based compensation expense			2 years 6 months
Restricted unit and phantom unit awards
Number of units
AMP LTIP Awards converted into AMC LTIP Awards			1,068,900
Granted (in shares)			729,755
Vested (in shares)			(443,036)
Forfeited (in shares)			(79,629)
Total awarded and unvested at the end of the period (in shares)		1,275,990	1,275,990
Weighted average grant date fair value
AMP LTIP Awards converted into AMC LTIP Awards (in dollars per unit)		$ 14.58	$ 14.58
Granted (in dollars per unit)			13.60
Vested (in dollars per unit)			13.57
Forfeited (in dollars per unit)			14.37
Total awarded and unvested at the end of the period (in dollars per unit)		$ 14.38	$ 14.38
Aggregate intrinsic value
Total awarded and unvested at the end of the period		$ 9,685	$ 9,685
Series B unit awards
Additional disclosures
Expense recognized				$ 34,000	$ 35,000
Units vested				65,745
2017 AMGP LTIP
Additional disclosures
Expense recognized			200	$ 700	$ 200
Shares exchange ratio	1.8926
AMC LTIP
Additional disclosures
Expense recognized				$ 2,700
Number of stock-based compensation awards authorized	15,398,901
Shares exchange ratio	1.8926
Number of shares available for future grant under the Plan						13,596,444
Series B Unit, Vested and Unvested
Additional disclosures
Shares exchange ratio	176.0041
Exchanged B Units
Additional disclosures
Expense recognized			$ 66,000
Shares exchanged	17,353,999
Common stock issued in exchange	98,600
Unvested Series B Units
Number of units
AMP LTIP Awards converted into AMC LTIP Awards	32,855
ROIC PSUs
Number of units
Granted (in shares)			164,196
Forfeited (in shares)			(15,890)
Total awarded and unvested at the end of the period (in shares)		148,306	148,306
Weighted average grant date fair value
Granted (in dollars per unit)			$ 6.32
Forfeited (in dollars per unit)			6.32
Total awarded and unvested at the end of the period (in dollars per unit)		$ 6.32	$ 6.32
Additional disclosures
Expense recognized			$ 200
Unamortized expense		$ 700	$ 700
Vesting period			3 years
Weighted average period for recognizing unrecognized stock-based compensation expense			2 years 3 months 18 days
ROIC PSUs | Minimum
Additional disclosures
Number of shares of common stock that may be earned ultimately.			0.00%
ROIC PSUs | Maximum
Additional disclosures
Number of shares of common stock that may be earned ultimately.			200.00%
IDR LLC
Additional disclosures
Percentage of amount of quarterly distribution in excess of threshold limit				6.00%
Threshold limit for quarterly distribution				$ 7,500
IDR LLC | Series B unit awards
Additional disclosures
Authorized units				98,600
Outstanding units				98,600
Threshold limit for conversion of units to common shares				$ 2,000,000
IDR LLC | Series B unit awards | Maximum
Additional disclosures
Percentage of amount of equity value in excess of threshold limit for conversion of units to common shares				6.00%
IDR LLC | Series B Unit Awards classified as equity
Number of units
Granted (in shares)			0
Additional disclosures
Floor equity value	$ 2,000,000
Expected volatility (as a percent)	40.00%
Risk free rate (as a percent)	2.51%
Weighted average cost of capital (as a percent)	7.25%
Estimated value (in dollars per unit)	$ 1,257