XML 50 R40.htm IDEA: XBRL DOCUMENT v3.20.2
Acquisitions and Divestitures - Additional Information (Detail) - $ / shares
May 05, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition And Divestiture [Line Items]      
Common stock, par value   $ 0.01 $ 0.01
Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member]      
Business Acquisition And Divestiture [Line Items]      
Merger conversion ratio 0.933    
Common stock, par value $ 0.01