Shareholders' and Members' Equity - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Apr. 23, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Basic net loss attributable to Brigham Minerals, Inc. shareholders		$ (1,856)	$ 0	$ (1,322)	$ 0
Less: net income attributable to Brigham Minerals, Inc. shareholders pre-IPO		(314)	0	(848)	0
Basic net loss attributable to Brigham Minerals, Inc. shareholders post-IPO		$ (2,170)	$ 0	$ (2,170)	$ 0
Denominator:
Basic weighted average shares outstanding (in shares)		17,819,000	0	8,959,000	0
Basic EPS attributable to Brigham Minerals, Inc. stockholders (in dollars per share)		$ (0.12)	$ 0.00	$ (0.24)	$ 0.00
Numerator:
Effect of Class B Shares		$ (2,941)	$ 0	$ (2,941)	$ 0
Diluted net loss attributable to Brigham Minerals, Inc. shareholders		$ (5,111)	$ 0	$ (5,111)	$ 0
Denominator:
Basic weighted average shares outstanding (in shares)		17,819,000	0	8,959,000	0
Effect of dilutive securities:
Class B Shares		23,718,000	0	11,925,000	0
Time-based restricted stock awards		(77,000)	0	(77,000)	0
Diluted weighted average shares outstanding (in shares)		41,460,000	0	20,806,000	0
Diluted EPS attributable to Brigham Minerals, Inc. stockholders (in dollars per share)		$ (0.123)	$ 0.00	$ (0.246)	$ 0.00
Performance-Based Restricted Stock Units
Class of Stock [Line Items]
Shares granted during period (in shares)	753,546