Acquisitions and Divestitures - Summary of Purchase Price Allocation (Detail) - Legacy Amplify, Midstates and Midstates Holdings, Inc. [Member] $ in Thousands	Aug. 06, 2019 USD ($)
Consideration:
Fair value of Midstates common stock issued in the Merger (a)	$ 90,150
Fair value of Midstates warrants issued in the Merger	2
Total consideration	90,152
Fair value of liabilities assumed:
Current liabilities	24,135
Long-term debt	76,559
Long-term asset retirement obligation	9,440
Other long-term liabilities	5,067
Amounts attributable to liabilities assumed	115,201
Fair value of assets acquired:
Cash and cash equivalents	19,250
Other current assets	17,862
Oil and natural gas properties	142,642
Other property and equipment	6,280
Long-term asset retirement cost	9,440
Other non-current assets	9,879
Amounts attributable to assets acquired	205,353
Total identifiable net assets	$ 90,152