Significant Accounting Policies - Narrative (Details) $ in Thousands		5 Months Ended	8 Months Ended	12 Months Ended
	Apr. 17, 2019	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / bbl $ / MMBTU	Dec. 31, 2018 USD ($) $ / bbl $ / MMBTU	Dec. 31, 2017 USD ($) $ / bbl $ / MMBTU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in investing cash flow				$ (216,832)	$ (195,268)	$ 26,172
Allowance for doubtful accounts			$ 556	556	382
Share based compensation expense				$ 19,333
Employer matching contribution, percent of match				100.00%
Employer matching contribution, percent of employees' total compensation				6.00%
Contributions				$ 300	200	100
Deferred tax asset arising from the IPO		$ 13,700	13,664
Timing of satisfaction of performance obligation and payment				The Company typically receives payment for oil, natural gas and NGL sales within 60 days of the month of delivery, which can extend up to 9 months after initial production from the well.
Debt issuance costs			1,200	$ 1,200	4,300
Accumulated amortization of debt issuance costs			$ 200	200	300
Amortization of debt issuance costs				$ 433	690	$ 121
Existing Owners of Brigham Minerals
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sale of stock, ownership percentage	10.50%
Existing Owners of Brigham Minerals | Class B Common Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sale of stock, ownership percentage	40.20%			56.70%
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in investing cash flow					$ 500
Crude Oil (MBbl)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average sales prices (in dollars per share) | $ / bbl				55.65	65.66	51.34
Natural gas (per Mcf)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Average sales prices (in dollars per share) | $ / MMBTU				2.60	3.12	2.99