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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-38040    
Entity Registrant Name Alta Mesa Resources, Inc. /DE    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-4433840    
Entity Address, Address Line One 15021 Katy Freeway,    
Entity Address, Address Line Two Suite 400,    
Entity Address, City or Town Houston,    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 77094    
City Area Code 281    
Local Phone Number 530-0991    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 16,522,531
Entity Central Index Key 0001690769    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for its 2020 annual meeting of shareholders, which will be filed with the Securities and Exchange Commission on Schedule 14A within 120 days after the end of 2019, will be incorporated by reference into Part III of this Form 10-K to the extent indicated therein upon such filing.
 

    
Common Class A      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   182,791,388  
Common Class C      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   199,987,976