v3.7.0.1
Document And Entity Information - shares
6 Months Ended
Jun. 30, 2017
Jul. 21, 2017
Document Information [Line Items]    
Entity Registrant Name RETAIL OPPORTUNITY INVESTMENTS CORP  
Trading Symbol ROIC  
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   109,730,196
Amendment Flag false  
Entity Central Index Key 0001407623  
Entity Filer Category Large Accelerated Filer  
Document Period End Date Jun. 30, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Retail Opportunity Investments Partnership L.P.    
Document Information [Line Items]    
Entity Registrant Name RETAIL OPPORTUNITY INVESTMENTS PARTNERSHIPS L.P.  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0001577230  
Entity Filer Category Non-accelerated Filer