Common Stock of ROIC	12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Common Stock of ROIC	Common Stock of ROIC Equity Issuance In connection with the acquisitions of Fullerton Crossroads and Riverstone Marketplace, a portion of the consideration for the properties was funded through the issuance of 2,405,430 OP Units. On December 12, 2017, the Company issued 2,584,254 shares of common stock, at a price per share of $21.25, in exchange for the 2,405,430 OP Units previously issued and the rights to approximately $3.8 million of cash to be used to acquire a third property to be identified by the Company. The proceeds of approximately $3.8 million are classified in Restricted Cash in the consolidated balance sheet as of December 31, 2017, as the proceeds are being held with an exchange accommodator under Section 1031 of the Code, and are expected to be used to purchase a replacement asset during the first half of 2018. The shares of common stock of the Company were issued in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder. On July 12, 2016, ROIC issued 6,555,000 shares of common stock in a registered public offering, including shares issued upon the exercise in full of the underwriters’ option to purchase additional shares, resulting in net proceeds of approximately $133.0 million, after deducting the underwriters’ discounts and commissions and offering expenses. The net proceeds were used to reduce borrowings under the Operating Partnership’s revolving credit facility. ATM On September 19, 2014, ROIC entered into three separate Sales Agreements (the “Original Sales Agreements”) with each of Jefferies LLC, KeyBanc Capital Markets Inc. and Raymond James & Associates, Inc. (each individually, an “Original Agent” and collectively, the “Original Agents”) pursuant to which ROIC may sell, from time to time, shares of ROIC’s common stock, par value $0.0001 per share, having an aggregate offering price of up to $100.0 million through the Original Agents either as agents or principals. On May 23, 2016, ROIC entered into two additional sales agreements (the “Additional Sales Agreements”, and together with the Original Sales Agreements, the “Sales Agreements”) with each of Canaccord Genuity Inc. and Robert W. Baird & Co. Incorporated (the “Additional Agents”, and together with the Original Agents, the “Agents”) pursuant to which the Company may sell shares of ROIC’s common stock through the Additional Agents either as agents or principals. During the year ended December 31, 2017, ROIC sold a total of 34,001 shares of common stock under the Sales Agreements, which resulted in gross proceeds of approximately $681,000 and commissions of approximately $9,000 paid to the Agents. During the year ended December 31, 2016, ROIC sold a total of 2,202,254 shares under the Sales Agreements, which resulted in gross proceeds of approximately $45.6 million and commissions of approximately $584,000 paid to the Agents. Stock Repurchase Program On July 31, 2013, ROIC’s board of directors authorized a stock repurchase program to repurchase up to a maximum of $50.0 million of the Company’s common stock. Through the year ended December 31, 2017, the Company has not repurchased any shares of common stock under this program.

Common Stock of ROIC

Equity Issuance

In connection with the acquisitions of Fullerton Crossroads and Riverstone Marketplace, a portion of the consideration for the properties was funded through the issuance of 2,405,430 OP Units. On December 12, 2017, the Company issued 2,584,254 shares of common stock, at a price per share of $21.25, in exchange for the 2,405,430 OP Units previously issued and the rights to approximately $3.8 million of cash to be used to acquire a third property to be identified by the Company. The proceeds of approximately $3.8 million are classified in Restricted Cash in the consolidated balance sheet as of December 31, 2017, as the proceeds are being held with an exchange accommodator under Section 1031 of the Code, and are expected to be used to purchase a replacement asset during the first half of 2018. The shares of common stock of the Company were issued in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended, and the rules and regulations promulgated thereunder.

On July 12, 2016, ROIC issued 6,555,000 shares of common stock in a registered public offering, including shares issued upon the exercise in full of the underwriters’ option to purchase additional shares, resulting in net proceeds of approximately $133.0 million, after deducting the underwriters’ discounts and commissions and offering expenses. The net proceeds were used to reduce borrowings under the Operating Partnership’s revolving credit facility.

ATM

On September 19, 2014, ROIC entered into three separate Sales Agreements (the “Original Sales Agreements”) with each of Jefferies LLC, KeyBanc Capital Markets Inc. and Raymond James & Associates, Inc. (each individually, an “Original Agent” and collectively, the “Original Agents”) pursuant to which ROIC may sell, from time to time, shares of ROIC’s common stock, par value $0.0001 per share, having an aggregate offering price of up to $100.0 million through the Original Agents either as agents or principals. On May 23, 2016, ROIC entered into two additional sales agreements (the “Additional Sales Agreements”, and together with the Original Sales Agreements, the “Sales Agreements”) with each of Canaccord Genuity Inc. and Robert W. Baird & Co. Incorporated (the “Additional Agents”, and together with the Original Agents, the “Agents”) pursuant to which the Company may sell shares of ROIC’s common stock through the Additional Agents either as agents or principals.

During the year ended December 31, 2017, ROIC sold a total of 34,001 shares of common stock under the Sales Agreements, which resulted in gross proceeds of approximately $681,000 and commissions of approximately $9,000 paid to the Agents. During the year ended December 31, 2016, ROIC sold a total of 2,202,254 shares under the Sales Agreements, which resulted in gross proceeds of approximately $45.6 million and commissions of approximately $584,000 paid to the Agents.

Stock Repurchase Program

On July 31, 2013, ROIC’s board of directors authorized a stock repurchase program to repurchase up to a maximum of $50.0 million of the Company’s common stock. Through the year ended December 31, 2017, the Company has not repurchased any shares of common stock under this program.