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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Mar. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-15663    
Entity Registrant Name American Realty Investors, Inc    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 75-2847135    
Entity Address, Address Line One 1603 LBJ Freeway,    
Entity Address, Address Line Two Suite 800    
Entity Address, City or Town Dallas    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75234    
City Area Code (469    
Local Phone Number 522-4200    
Title of 12(b) Security Common Stock    
Trading Symbol ARL    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
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     $ 13.1
Entity Common Stock, Shares Outstanding   16,152,043  
Documents Incorporated by Reference
Consolidated Financial Statements of Income Opportunity Realty Investors, Inc.; Commission File No. 001-14784
Consolidated Financial Statements of Transcontinental Realty Investors, Inc.; Commission File No. 001-09240
    
Entity Central Index Key 0001102238    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021