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
Value of shares to be issued	90,152
Fair value of Legacy Amplify restricted share consideration	832
Fair value of Legacy Amplify PSU consideration	557
Total consideration	91,541
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	149,421
Other property and equipment	1,694
Long-term asset retirement cost	9,440
Other non-current assets	9,075
Amounts attributable to assets acquired	206,742
Total identifiable net assets	$ 91,541

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