Shareholders' and Members' Equity - Narrative (Details)		6 Months Ended
	Apr. 17, 2019	Jun. 30, 2019 vote shares
Class A Common Stock
Class of Stock [Line Items]
Common stock outstanding (in shares) | shares		21,997,198
Number of votes per share (vote) | vote		1
Class B Common Stock
Class of Stock [Line Items]
Common stock outstanding (in shares) | shares		28,777,802
Number of votes per share (vote) | vote		1
Brigham LLC
Class of Stock [Line Items]
Ownership percentage by subsidiary	43.30%