Organization and Presentation (Details) $ / shares in Units, $ in Millions		9 Months Ended
	Aug. 23, 2018 USD ($) a Vote shares	Sep. 30, 2019 USD ($) Vote $ / shares
Business Acquisition [Line Items]
Description of the acquisition		(i) $400 million of cash and (ii) 40 million OpCo Common Units. The Company also issued to the Contributors 40 million shares of non-economic Class C Common Stock of the Company, which entitles each holder to one vote per share. The OpCo Common Units are redeemable on a one-for-one basis for shares of Class A Common Stock at the option of the Contributors. Upon the redemption by any Contributor of OpCo Common Units for Class A Common Stock, a corresponding number of shares of Class C Common Stock held by such Contributor will be cancelled
Descriptions of royalties		The Company’s assets, via its controlling interest in OpCo, consist of royalty interests, mineral interests, non-participating royalty interests and overriding royalty interests, or ORRIs (collectively, “Royalties”), underlying approximately 256,000 gross unit acres that are concentrated in what the Company believes is the “core-of-the-core” of liquids-rich condensate region of the Eagle Ford Share in Karnes, DeWitt and Gonzales Counties, Texas. The company owns additional assets of approximately 68,000 gross unit acres in Pennsylvania, Ohio and West Virginia that is prospective for Marcellus Shale.
Royal Entities [Member]
Business Acquisition [Line Items]
Cash paid | $	$ 400	$ 400
Royal Entities [Member] | Subsidiaries [Member]
Business Acquisition [Line Items]
Common units issued | shares	40,000,000
Royal Entities [Member] | Subsidiaries [Member] | Texas [Member]
Business Acquisition [Line Items]
Gross acres owned by the company | a	256,000
Royal Entities [Member] | Subsidiaries [Member] | Pennsylvania, Ohio and West Virginia [Member]
Business Acquisition [Line Items]
Gross acres owned by the company | a	68,000
Royal Entities [Member] | Class C common stock [Member]
Business Acquisition [Line Items]
Common stock, number of votes per share | Vote	1
Common stock issued or agreed to issue | shares	40,000,000
Class A common stock [Member]
Business Acquisition [Line Items]
Common stock, par value | $ / shares		$ 0.0001
Common stock, number of votes per share | Vote		1
Class A common stock [Member] | Royal Entities [Member]
Business Acquisition [Line Items]
Common units redemption ratio	100.00%
Class A common stock [Member] | Royal Entities [Member] | Subsidiaries [Member]
Business Acquisition [Line Items]
Common units redemption ratio	100.00%