Organization, Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation Between Basic and Diluted EPS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income	$ 8,696	$ 12,466
Less income attributable to non-controlling interests	(554)	(825)
Less earnings allocated to participating securities	(120)	(88)
Net income available for common stockholders, basic	8,022	11,553
Less earnings allocated to participating securities	(120)	(88)
Net income available for common stockholders, diluted	$ 8,576	$ 12,378
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)	124,227,368	122,410,238
Denominator for diluted EPS – weighted average common equivalent shares (in shares)	133,007,419	131,438,668
Retail Opportunity Investments Partnership L.P.
Numerator:
Net income	$ 8,696	$ 12,466
Less earnings allocated to participating securities	(120)	(88)
Net income available to unitholders, basic and diluted	$ 8,576	$ 12,378
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)	132,674,485	131,106,973
Denominator for diluted EPS – weighted average common equivalent shares (in shares)	133,007,419	131,438,668
OP Units
Denominator:
OP Units (in shares)	8,447,117	8,696,735
Performance-based restricted stock awards and LTIP Units
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	332,934	330,337
Performance-based restricted stock awards and LTIP Units | Retail Opportunity Investments Partnership L.P.
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	332,934	330,337
Stock options
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0	1,358
Stock options | Retail Opportunity Investments Partnership L.P.
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0	1,358