v3.19.3
Cover Page - shares
9 Months Ended
Sep. 30, 2019
Oct. 25, 2019
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
Document Transition Report false  
Entity File Number 001-33749  
Entity Registrant Name RETAIL OPPORTUNITY INVESTMENTS CORP  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 26-0500600  
Entity Address, Address Line One 11250 El Camino Real  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town San Diego,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92130  
City Area Code 858  
Local Phone Number 677-0900  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Common Stock, par value $0.0001 per share  
Trading Symbol ROIC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding (in shares)   115,996,426
Current Fiscal Year End Date --12-31  
Amendment Flag false  
Entity Central Index Key 0001407623  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Retail Opportunity Investments Partnership L.P.    
Document Information [Line Items]    
Entity Registrant Name RETAIL OPPORTUNITY INVESTMENTS PARTNERSHIP, LP  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 94-2969738  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001577230