Equity (Deficit) - Summary of Changes in Number of Outstanding Common Units and Shares of Common Stock (Detail) - shares			1 Months Ended	4 Months Ended	5 Months Ended	6 Months Ended	7 Months Ended	8 Months Ended	12 Months Ended
		May 04, 2017	Aug. 05, 2019	May 04, 2017	Dec. 31, 2019	Jun. 30, 2019	Aug. 05, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Summary of Changes in Number of Outstanding Units/Shares [Line Item]
Beginning balance						22,181,881	22,181,881	25,000,000	22,181,881
Ending balance		25,000,000		25,000,000	37,566,540				37,566,540	22,181,881
Common Shares/Units [Member]
Summary of Changes in Number of Outstanding Units/Shares [Line Item]
Beginning balance			22,305,256		22,334,010	22,181,881	22,181,881	25,000,000	22,181,881	25,000,000
Issuance of common stock		25,000,000				0		0		0
Restricted stock units vested			38,181		682,552	412,938				163,700
Repurchase of common shares			(9,427)		(31,697)	(120,163)				(65,152)
Restricted Common Stock Repurchased and Retired Under Tender Offer										(2,916,667)
Ending balance		25,000,000	22,334,010	25,000,000	37,566,540	22,305,256	22,334,010	25,000,000	37,566,540	22,181,881
Common stock repurchased and retired under share repurchase program					(4,195,247)	(169,400)
Ratio to convert Amplify shares					0.933
Common stock issued to Legacy Amplify stockholders					20,837,633				20,837,633
Midstates stock outstanding and acquired with the Merger					20,415,005
Treasury shares acquired from the Merger					205,861
Cancelation and retirement of shares					(347,567)
Predecessor [Member] | Limited Partners Common Units [Member]
Summary of Changes in Number of Outstanding Units/Shares [Line Item]
Beginning balance				83,827,920				83,800,287
Beginning balance								0
Restricted common units issued				0
Restricted common units/shares forfeited				(12,952)
Restricted common units/shares repurchased	[1]			(14,681)
Cancellation of Predecessor common units				(83,800,287)
Ending balance		83,800,287		83,800,287
Ending balance		0		0

[1] Restricted common units were generally net-settled by our Predecessor unitholders to cover the required withholding tax upon vesting. The Predecessor unitholders surrendered units with value equivalent to the employees’ minimum statutory obligation for the applicable income and other employment taxes. Total payments remitted for the employees’ tax obligations to the appropriate taxing authorities were less than approximately $0.1 million for the period from January 1, 2017 through May 4, 2017. These net-settlements had the effect of unit repurchases by the Company as they reduced the number of units that would have otherwise been outstanding as a result of the vesting and did not represent an expense to the Company.