Organization and Basis of Presentation - Additional Information (Detail)		2 Months Ended	9 Months Ended	12 Months Ended
	May 05, 2019 shares	Sep. 30, 2019 shares	Sep. 30, 2019 Segment	Dec. 31, 2018
Consolidation And Basis Of Presentation [Line Items]
Number of reportable business segments | Segment			1
Number of common stock share for each share		0.933
Legacy Amplify [Member]
Consolidation And Basis Of Presentation [Line Items]
Number of common stock share for each share	0.933
Crude Oil Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				50.00%
Natural Gas Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				35.00%
Natural Gas Liquids Reserves [Member]
Consolidation And Basis Of Presentation [Line Items]
Proved reserves				15.00%