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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2024
Aug. 01, 2024
Document and Entity Information    
Entity Registrant Name ONE LIBERTY PROPERTIES INC  
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2024  
Entity File Number 001-09279  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 13-3147497  
Entity Address, Address Line One 60 Cutter Mill Road  
Entity Address, City or Town Great Neck  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 11021  
City Area Code 516  
Local Phone Number 466-3100  
Title of 12(b) Security Common Stock  
Trading Symbol OLP  
Security Exchange Name NYSE  
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 Common Stock, Shares Outstanding   21,340,344
Entity Central Index Key 0000712770  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false