Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Net (loss) income attributable to Matador Resources Company shareholders — numerator	$ (593,205)	$ 87,777	$ 274,207
Weighted average common shares outstanding — denominator
Basic (in shares)	116,068	116,555	113,580
Dilutive effect of options and restricted stock units (in shares)	0	508	111
Diluted weighted average common shares outstanding (in shares)	116,068	117,063	113,691
Earnings per common share attributable to Matador Resources Company shareholders
Basic (usd per share)	$ (5.11)	$ 0.75	$ 2.41
Diluted (usd per share)	$ (5.11)	$ 0.75	$ 2.41