Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Accumulated dividends in excess of earnings	Accumulated other comprehensive income (loss)	Non- controlling interests	Officer	Officer Accumulated dividends in excess of earnings	Officer Non- controlling interests
Balance (in shares) at Dec. 31, 2020		118,085,155
Balance at Dec. 31, 2020	$ 1,291,159	$ 12	$ 1,497,662	$ (289,309)	$ (8,812)	$ 91,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the Equity Incentive Plan (in shares)		535,819
Shares issued under the Equity Incentive Plan	428		428
Shares withheld for employee taxes (in shares)		(142,247)
Shares withheld for employee taxes	(1,905)		(1,905)
Stock based compensation expense	2,063		1,809			254
Equity Redemption of OP Units (in shares)		98,986
Redemption of OP Units			1,439			(1,439)
Adjustment to non-controlling interests ownership in Operating Partnership	0		2			(2)
Registration expenditures	(15)		(15)
Cash dividends	(14,019)			(13,041)		(978)	$ (68)	$ (48)	$ (20)
Net income attributable to Retail Opportunity Investments Corp.	7,415			7,415
Net income attributable to non-controlling interests	559					559
Other comprehensive income	1,573				1,454	119
Balance (in shares) at Mar. 31, 2021		118,577,713
Balance at Mar. 31, 2021	1,287,190	$ 12	1,499,420	(294,983)	(7,358)	90,099
Balance (in shares) at Dec. 31, 2020		118,085,155
Balance at Dec. 31, 2020	1,291,159	$ 12	1,497,662	(289,309)	(8,812)	91,606
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Redemption of OP Units	6,858
Net income attributable to Retail Opportunity Investments Corp.	44,994
Net income attributable to non-controlling interests	3,254
Balance (in shares) at Sep. 30, 2021		121,423,616
Balance at Sep. 30, 2021	1,352,880	$ 12	1,552,447	(284,144)	(4,877)	89,442
Balance (in shares) at Mar. 31, 2021		118,577,713
Balance at Mar. 31, 2021	1,287,190	$ 12	1,499,420	(294,983)	(7,358)	90,099
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	3,233		2,774			459
Equity Redemption of OP Units (in shares)		325,000
Redemption of OP Units	0		5,419			(5,419)
Adjustment to non-controlling interests ownership in Operating Partnership	0		(2,823)			2,823
Proceeds from the issuance of common stock, Shares		1,903,653
Proceeds from the issuance of common stock	34,844		34,844
Registration expenditures	(371)		(371)
Cash dividends	(14,210)			(13,270)		(940)	(80)	(70)	(10)
Net income attributable to Retail Opportunity Investments Corp.	16,484			16,484
Net income attributable to non-controlling interests	1,201					1,201
Other comprehensive income	1,343				1,225	118
Balance (in shares) at Jun. 30, 2021		120,806,366
Balance at Jun. 30, 2021	1,329,634	$ 12	1,539,263	(291,839)	(6,133)	88,331
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cancellation of restricted stock (in shares)		(5,482)
Stock based compensation expense	2,567		2,293			274
Adjustment to non-controlling interests ownership in Operating Partnership			(211)			211
Proceeds from the issuance of common stock, Shares		622,732
Proceeds from the issuance of common stock	11,217	$ 0	11,217
Registration expenditures	(115)		(115)
Cash dividends	(14,295)			(13,356)		(939)	(64)	(44)	(20)
Net income attributable to Retail Opportunity Investments Corp.	21,095			21,095
Net income attributable to non-controlling interests	1,494					1,494
Other comprehensive income	1,347				1,256	91
Balance (in shares) at Sep. 30, 2021		121,423,616
Balance at Sep. 30, 2021	$ 1,352,880	$ 12	1,552,447	(284,144)	(4,877)	89,442
Balance (in shares) at Dec. 31, 2021	122,685,266	122,685,266
Balance at Dec. 31, 2021	$ 1,366,353	$ 12	1,577,837	(297,801)	(3,154)	89,459
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under the Equity Incentive Plan (in shares)		406,106
Shares issued under the Equity Incentive Plan	302		302
Shares withheld for employee taxes (in shares)		(122,658)
Shares withheld for employee taxes	(2,405)		(2,405)
Cancellation of restricted stock (in shares)		(10,649)
Stock based compensation expense	2,572		2,572
Equity Redemption of OP Units (in shares)		50,000
Redemption of OP Units			978			(978)
Adjustment to non-controlling interests ownership in Operating Partnership	0		(2,668)			2,668
Proceeds from the issuance of common stock, Shares		724,279
Proceeds from the issuance of common stock	14,211		14,211
Registration expenditures	(172)		(172)
Cash dividends	(17,139)			(16,009)		(1,130)	(110)	(110)	0
Net income attributable to Retail Opportunity Investments Corp.	11,641			11,641
Net income attributable to non-controlling interests	825					825
Other comprehensive income	2,203				2,059	144
Balance (in shares) at Mar. 31, 2022		123,732,344
Balance at Mar. 31, 2022	$ 1,378,281	$ 12	1,590,655	(302,279)	(1,095)	90,988
Balance (in shares) at Dec. 31, 2021	122,685,266	122,685,266
Balance at Dec. 31, 2021	$ 1,366,353	$ 12	1,577,837	(297,801)	(3,154)	89,459
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity Redemption of OP Units (in shares)	296,840	296,840
Redemption of OP Units	$ 5,071
Net income attributable to Retail Opportunity Investments Corp.	41,670
Net income attributable to non-controlling interests	$ 2,896
Balance (in shares) at Sep. 30, 2022	124,541,618	124,541,618
Balance at Sep. 30, 2022	$ 1,391,077	$ 12	1,609,588	(307,394)	27	88,844
Balance (in shares) at Mar. 31, 2022		123,732,344
Balance at Mar. 31, 2022	1,378,281	$ 12	1,590,655	(302,279)	(1,095)	90,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cancellation of restricted stock (in shares)		(1,500)
Stock based compensation expense	3,028		3,028			0
Equity Redemption of OP Units (in shares)		46,840
Redemption of OP Units	0		917			(917)
Adjustment to non-controlling interests ownership in Operating Partnership	0		(932)			932
Proceeds from the issuance of common stock, Shares		563,934
Proceeds from the issuance of common stock	10,988		10,988
Registration expenditures	(161)		(161)
Cash dividends	(17,290)			(16,164)		(1,126)	(103)	(103)	0
Net income attributable to Retail Opportunity Investments Corp.	11,507			11,507
Net income attributable to non-controlling interests	807					807
Other comprehensive income	1,167				1,090	77
Balance (in shares) at Jun. 30, 2022		124,341,618
Balance at Jun. 30, 2022	1,388,224	$ 12	1,604,495	(307,039)	(5)	90,761
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	3,221		3,221			0
Equity Redemption of OP Units (in shares)		200,000
Redemption of OP Units			3,176			(3,176)
Adjustment to non-controlling interests ownership in Operating Partnership			(1,260)			1,260
Registration expenditures	(44)		(44)
Cash dividends	(19,947)			(18,680)		(1,267)	$ (197)	$ (197)	$ 0
Net income attributable to Retail Opportunity Investments Corp.	18,522			18,522
Net income attributable to non-controlling interests	1,264					1,264
Other comprehensive income	$ 34				32	2
Balance (in shares) at Sep. 30, 2022	124,541,618	124,541,618
Balance at Sep. 30, 2022	$ 1,391,077	$ 12	$ 1,609,588	$ (307,394)	$ 27	$ 88,844