Real Estate Investments (Pro Forma Financial Information - Results of Operations Had the Acquisitions Occurred at the Beginning of the Year) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of operations:
Revenues	$ 60,290	$ 57,049	$ 122,080	$ 113,005
Net income attributable to Retail Opportunity Investments Corp.	$ 7,909	$ 6,330	$ 16,535	$ 11,897

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration