Organization, Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation Between Basic and Diluted EPS (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income	$ 10,518		$ 12,314		$ 19,214	$ 24,780
Less income attributable to non-controlling interests	(589)	$ (554)	(807)	$ (825)	(1,143)	(1,632)
Less earnings allocated to participating securities	(112)		(88)		(232)	(176)
Net income available for common stockholders, basic	9,817		11,419		17,839	22,972
Less earnings allocated to participating securities	(112)		(88)		(232)	(176)
Net income available for common stockholders, diluted	$ 10,406		$ 12,226		$ 18,982	$ 24,604
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)	125,125,235		123,537,494		124,678,781	122,976,980
Denominator for diluted EPS – weighted average common equivalent shares (in shares)	133,043,829		132,580,586		133,068,735	132,041,664
Retail Opportunity Investments Partnership L.P.
Numerator:
Net income	$ 10,518	$ 8,696	$ 12,314	$ 12,466	$ 19,214	$ 24,780
Less earnings allocated to participating securities	(112)		(88)		(232)	(176)
Net income available to unitholders, basic and diluted	$ 10,406		$ 12,226		$ 18,982	$ 24,604
Denominator:
Denominator for basic EPS – weighted average common equivalent shares (in shares)	132,686,857		132,200,567		132,680,705	131,656,791
Denominator for diluted EPS – weighted average common equivalent shares (in shares)	133,043,829		132,580,586		133,068,735	132,041,664
OP Units
Denominator:
OP Units (in shares)	7,561,622		8,663,073		8,001,924	8,679,811
Performance-based restricted stock awards and LTIP Units
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	356,972		378,819		388,030	383,592
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)	356,972		378,819		388,030	383,592
Stock options
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0		1,200		0	1,281
Stock options | Retail Opportunity Investments Partnership L.P.
Denominator:
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares)	0		1,200		0	1,281