Consolidated Statements of Partners' Capital - USD ($) $ in Thousands		Total	Retail Opportunity Investments Partnership L.P.	Retail Opportunity Investments Partnership L.P. Officer	Retail Opportunity Investments Partnership L.P. Limited Partner’s Capital		Retail Opportunity Investments Partnership L.P. Limited Partner’s Capital Officer	[1]	Retail Opportunity Investments Partnership L.P. ROIC Capital		Retail Opportunity Investments Partnership L.P. ROIC Capital Officer	[2]	Retail Opportunity Investments Partnership L.P. Accumulated other comprehensive income (loss)
Balance (in shares) at Dec. 31, 2020					8,966,083	[1]			118,085,155	[2]
Balance at Dec. 31, 2020			$ 1,291,159		$ 92,279	[1]			$ 1,208,365	[2]			$ (9,485)
Increase (Decrease) in Partners' Capital [Roll Forward]
OP units issued under the Equity Incentive Plan (in shares)	[2]								535,819
OP Units issued under the Equity Incentive Plan		$ 428	428						$ 428	[2]
OP Units withheld for employee taxes (in shares)	[2]								(142,247)
OP Units withheld for employee taxes		(1,905)	(1,905)						$ (1,905)	[2]
Stock based compensation expense		2,063	2,063		$ 254	[1]			$ 1,809	[2]
Equity Redemption of OP Units (in shares)					(98,986)	[1]			98,986	[2]
Equity redemption of OP Units					$ (1,439)	[1]			$ 1,439	[2]
Adjustment to non-controlling interests ownership in Operating Partnership		0	0		(2)	[1]			2	[2]
Registration expenditures		(15)	(15)						(15)	[2]
Cash distributions			(14,019)	$ (68)	(978)	[1]	$ (20)		(13,041)	[2]	$ (48)
Net income attributable to Retail Opportunity Investments Partnership, LP			7,974		$ 559	[1]			$ 7,415	[2]
Other comprehensive income		1,573	1,573										1,573
Balance (in shares) at Mar. 31, 2021					8,867,097	[1]			118,577,713	[2]
Balance at Mar. 31, 2021			1,287,190		$ 90,653	[1]			$ 1,204,449	[2]			(7,912)
Balance (in shares) at Dec. 31, 2020					8,966,083	[1]			118,085,155	[2]
Balance at Dec. 31, 2020			1,291,159		$ 92,279	[1]			$ 1,208,365	[2]			(9,485)
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity redemption of OP Units		6,858	6,858
Net income attributable to Retail Opportunity Investments Partnership, LP		48,248	48,248
Balance (in shares) at Sep. 30, 2021					8,542,097	[1]			121,423,616	[2]
Balance at Sep. 30, 2021			1,352,880		$ 89,787	[1]			$ 1,268,315	[2]			(5,222)
Balance (in shares) at Mar. 31, 2021					8,867,097	[1]			118,577,713	[2]
Balance at Mar. 31, 2021			1,287,190		$ 90,653	[1]			$ 1,204,449	[2]			(7,912)
Increase (Decrease) in Partners' Capital [Roll Forward]
Stock based compensation expense		3,233	3,233		$ 459	[1]			$ 2,774	[2]
Equity Redemption of OP Units (in shares)					(325,000)	[1]			325,000	[2]
Equity redemption of OP Units		0	0		$ (5,419)	[1]			$ 5,419	[2]
Adjustment to non-controlling interests ownership in Operating Partnership		0	0		2,823	[1]			$ (2,823)	[2]
Issuance of OP Units in connection with sale of common stock (in units)	[2]								1,903,653
Issuance of OP Units in connection with sale of common stock			34,844						$ 34,844	[2]
Registration expenditures		(371)	(371)						(371)	[2]
Cash distributions			(14,210)	(80)	(940)	[1]	(10)		(13,270)	[2]	(70)
Net income attributable to Retail Opportunity Investments Partnership, LP			17,685		$ 1,201	[1]			$ 16,484	[2]
Other comprehensive income		1,343	1,343										1,343
Balance (in shares) at Jun. 30, 2021					8,542,097	[1]			120,806,366	[2]
Balance at Jun. 30, 2021			1,329,634		$ 88,767	[1]			$ 1,247,436	[2]			(6,569)
Increase (Decrease) in Partners' Capital [Roll Forward]
Cancellation of OP Units (in shares)	[2]								(5,482)
Stock based compensation expense		2,567	2,567		274	[1]			$ 2,293	[2]
Adjustment to non-controlling interests ownership in Operating Partnership					211	[1]			$ (211)	[2]
Issuance of OP Units in connection with sale of common stock (in units)	[2]								622,732
Issuance of OP Units in connection with sale of common stock			11,217						$ 11,217	[2]
Registration expenditures		(115)	(115)						(115)	[2]
Cash distributions			(14,295)	(64)	(939)	[1]	(20)		(13,356)	[2]	(44)
Net income attributable to Retail Opportunity Investments Partnership, LP		22,589	22,589		$ 1,494	[1]			$ 21,095	[2]
Other comprehensive income		1,347	1,347										1,347
Balance (in shares) at Sep. 30, 2021					8,542,097	[1]			121,423,616	[2]
Balance at Sep. 30, 2021			1,352,880		$ 89,787	[1]			$ 1,268,315	[2]			(5,222)
Balance (in shares) at Dec. 31, 2021					8,542,097	[1]			122,685,266	[2]
Balance at Dec. 31, 2021			1,366,353		$ 89,680	[1]			$ 1,280,048	[2]			(3,375)
Increase (Decrease) in Partners' Capital [Roll Forward]
OP units issued under the Equity Incentive Plan (in shares)					201,860	[1]			406,106	[2]
OP Units issued under the Equity Incentive Plan		302	302						$ 302	[2]
OP Units withheld for employee taxes (in shares)	[2]								(122,658)
OP Units withheld for employee taxes		(2,405)	(2,405)						$ (2,405)	[2]
Cancellation of OP Units (in shares)	[2]								(10,649)
Stock based compensation expense		2,572	2,572		$ 0	[1]			$ 2,572	[2]
Equity Redemption of OP Units (in shares)					(50,000)	[1]			50,000	[2]
Equity redemption of OP Units					$ (978)	[1]			$ 978	[2]
Adjustment to non-controlling interests ownership in Operating Partnership		0	0		2,668	[1]			$ (2,668)	[2]
Issuance of OP Units in connection with sale of common stock (in units)	[2]								724,279
Issuance of OP Units in connection with sale of common stock			14,211						$ 14,211	[2]
Registration expenditures		(172)	(172)						(172)	[2]
Cash distributions			(17,139)	(110)	(1,130)	[1]	0		(16,009)	[2]	(110)
Net income attributable to Retail Opportunity Investments Partnership, LP			12,466		$ 825	[1]			$ 11,641	[2]
Other comprehensive income		$ 2,203	2,203										2,203
Balance (in shares) at Mar. 31, 2022					8,693,957	[1]			123,732,344	[2]
Balance at Mar. 31, 2022			1,378,281		$ 91,065	[1]			$ 1,288,388	[2]			(1,172)
Balance (in shares) at Dec. 31, 2021					8,542,097	[1]			122,685,266	[2]
Balance at Dec. 31, 2021			1,366,353		$ 89,680	[1]			$ 1,280,048	[2]			(3,375)
Increase (Decrease) in Partners' Capital [Roll Forward]
Equity Redemption of OP Units (in shares)		296,840
Equity redemption of OP Units		$ 5,071	5,071
Net income attributable to Retail Opportunity Investments Partnership, LP		$ 44,566	44,566
Balance (in shares) at Sep. 30, 2022		132,988,735			8,447,117	[1]			124,541,618	[2]
Balance at Sep. 30, 2022			1,391,077		$ 88,842	[1]			$ 1,302,206	[2]			29
Balance (in shares) at Mar. 31, 2022					8,693,957	[1]			123,732,344	[2]
Balance at Mar. 31, 2022			1,378,281		$ 91,065	[1]			$ 1,288,388	[2]			(1,172)
Increase (Decrease) in Partners' Capital [Roll Forward]
Cancellation of OP Units (in shares)	[2]								(1,500)
Stock based compensation expense		$ 3,028	3,028		$ 0	[1]			$ 3,028	[2]
Equity Redemption of OP Units (in shares)					(46,840)	[1]			46,840	[2]
Equity redemption of OP Units		0	0		$ (917)	[1]			$ 917	[2]
Adjustment to non-controlling interests ownership in Operating Partnership		0	0		932	[1]			$ (932)	[2]
Issuance of OP Units in connection with sale of common stock (in units)	[2]								563,934
Issuance of OP Units in connection with sale of common stock			10,988						$ 10,988	[2]
Registration expenditures		(161)	(161)						(161)	[2]
Cash distributions			(17,290)	(103)	(1,126)	[1]	0		(16,164)	[2]	(103)
Net income attributable to Retail Opportunity Investments Partnership, LP			12,314		$ 807	[1]			$ 11,507	[2]
Other comprehensive income		1,167	1,167										1,167
Balance (in shares) at Jun. 30, 2022					8,647,117	[1]			124,341,618	[2]
Balance at Jun. 30, 2022			1,388,224		$ 90,761	[1]			$ 1,297,468	[2]			(5)
Increase (Decrease) in Partners' Capital [Roll Forward]
Stock based compensation expense		3,221	$ 3,221		$ 0	[1]			3,221	[2]
Equity Redemption of OP Units (in shares)			200,000		200,000	[1]
Equity redemption of OP Units					$ (3,176)				3,176
Adjustment to non-controlling interests ownership in Operating Partnership					1,260	[1]			(1,260)	[2]
Registration expenditures		(44)	$ (44)						(44)	[2]
Cash distributions			(19,947)	$ (197)	(1,267)	[1]	$ 0		(18,680)	[2]	$ (197)
Net income attributable to Retail Opportunity Investments Partnership, LP		19,786	19,786		$ 1,264	[1]			$ 18,522	[2]
Other comprehensive income		$ 34	34										34
Balance (in shares) at Sep. 30, 2022		132,988,735			8,447,117	[1]			124,541,618	[2]
Balance at Sep. 30, 2022			$ 1,391,077		$ 88,842	[1]			$ 1,302,206	[2]			$ 29

[1] Consists of limited partnership interests held by third parties.

[2] Consists of general and limited partnership interests held by ROIC.