Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document Information [Line Items]
Document Type	10-Q
Entity Registrant Name	Altus Midstream Company
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	ALTM
Entity Central Index Key	0001692787
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Small Business	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		74,929,305
Class C Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		250,000,000