Business and Basis of Presentation (Details)					6 Months Ended	8 Months Ended	12 Months Ended
	Dec. 17, 2019	Dec. 16, 2019 USD ($) $ / shares shares	May 07, 2019 USD ($)	Apr. 17, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) segment business	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 31, 2019 USD ($)	Jul. 27, 2018 USD ($)	Jul. 16, 2018
Schedule of Equity Method Investments [Line Items]
Number of operating segments | segment							1
Number of distinct lines of business | business							2
Equity securities distributed							$ 0	$ 3,313,000	$ (20,092,000)
Unamortized debt issuance costs written off			$ 4,000,000
Prepayment premium paid							2,091,000	0	0
Gain (loss) on debt extinguishment			(6,900,000)				(6,892,000)	0	0
Adjustment to APIC, stock issuance costs						$ 8,700,000	5,100,000	3,600,000
Share based compensation, additional charge							11,900,000
Capitalized share based compensation							3,818,000	$ 0	0
Share based compensation expense							19,333,000
Brigham Minerals LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage by subsidiary				43.30%
Percentage of voting rights owned				100.00%
Brigham Resources, LLC
Schedule of Equity Method Investments [Line Items]
Cash collateral posted for existing swap contracts										$ 1,600,000	$ 1,400,000
Brigham Resources
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage												16.50%
Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Share price (in dollars per share) | $ / shares				$ 18.00
Initial Public Offering
Schedule of Equity Method Investments [Line Items]
Consideration received					$ 273,400,000
Initial Public Offering | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, number of shares issued (in shares) | shares				16,675,000
Share price (in dollars per share) | $ / shares				$ 18.00
Sale of stock, ownership percentage				75.80%
December Offering | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, number of shares issued (in shares) | shares		12,650,000
December Offering, Company
Schedule of Equity Method Investments [Line Items]
Consideration received		$ 102,700,000
Sale of stock, ownership percentage	59.80%
December Offering, Company | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, number of shares issued (in shares) | shares		6,000,000
December Offering, Selling Shareholders | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, number of shares issued (in shares) | shares		6,650,000
Share price (in dollars per share) | $ / shares		$ 18.10
Share price, net (in dollars per share) | $ / shares		$ 17.376
December Offering, Equivalent Units Issued | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, number of shares issued (in shares) | shares		5,496,813
Term Loan Facility
Schedule of Equity Method Investments [Line Items]
Prepayment premium paid			2,100,000
Legal fees paid			800,000
Line of credit, borrowing base											$ 125,000,000
New Revolving Credit Facility
Schedule of Equity Method Investments [Line Items]
Repayments of lines of credit		$ 80,000,000	$ 200,000,000
New Revolving Credit Facility | Brigham Resources, LLC
Schedule of Equity Method Investments [Line Items]
Line of credit, borrowing base				$ 135,000,000.0			$ 150,000,000.0
Existing Owners of Brigham Minerals
Schedule of Equity Method Investments [Line Items]
Sale of stock, ownership percentage				10.50%
Existing Owners of Brigham Minerals | Class A Common Stock
Schedule of Equity Method Investments [Line Items]
Number of shares owned after transaction (in shares) | shares				5,322,197
Sale of stock, ownership percentage				24.20%
Existing Owners of Brigham Minerals | Class B Common Stock
Schedule of Equity Method Investments [Line Items]
Sale of stock, ownership percentage				40.20%			56.70%
Existing Owners of Brigham Minerals | December Offering, Company
Schedule of Equity Method Investments [Line Items]
Sale of stock, ownership percentage	39.10%
Investors in Offering
Schedule of Equity Method Investments [Line Items]
Sale of stock, ownership percentage				32.80%
Previously Reported
Schedule of Equity Method Investments [Line Items]
Equity securities distributed									37,988,000
Operating expenses									$ 94,600,000
Incentive Units
Schedule of Equity Method Investments [Line Items]
Compensation expense, cumulative effect adjustment at IPO							$ 2,000,000
Share based compensation expense							$ 1,958,000