Shareholders' and Members' Equity - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Apr. 16, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Basic net income attributable to Brigham Minerals, Inc. shareholders									$ 848	$ 6,053	$ 6,901	$ 1,839	$ 0
Less: net income attributable to Brigham Minerals, Inc. shareholders pre-IPO											(848)	0	0
Basic net income attributable to Brigham Minerals, Inc. shareholders post-IPO											$ 6,053	$ 0	$ 0
Denominator:
Basic weighted average shares outstanding (in shares)											22,870	0	0
Basic EPS attributable to Brigham Minerals, Inc. stockholders (in dollars per share)	$ 0.20	$ 0.14	$ (0.12)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00			$ 0.26	$ 0.00	$ 0.00
Numerator:
Diluted net income attributable to Brigham Minerals, Inc. shareholders											$ 6,053	$ 0	$ 0
Denominator:
Basic weighted average shares outstanding (in shares)											22,870	0	0
Diluted weighted average shares outstanding (in shares)											22,870	0	0
Diluted EPS attributable to Brigham Minerals, Inc. stockholders (in dollars per share)	$ 0.20	$ 0.14	$ (0.12)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00			$ 0.26	$ 0.00	$ 0.00