Organization	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization First Industrial Realty Trust, Inc. (the "Company") is a self-administered and fully integrated real estate company which owns, manages, acquires, sells, develops and redevelops industrial real estate. The Company is a Maryland corporation organized on August 10, 1993 and a real estate investment trust ("REIT") as defined in the Internal Revenue Code of 1986 (the "Code"). Unless stated otherwise or the context otherwise requires, the terms "we," "our" and "us" refer to the Company and its subsidiaries, including its operating partnership, First Industrial, L.P. (the "Operating Partnership"), and its consolidated subsidiaries. We began operations on July 1, 1994. The Company's operations are conducted primarily through the Operating Partnership, of which the Company is the sole general partner (the "General Partner"), with an approximate 98.0% and 96.8% ownership interest ("General Partner Units") at December 31, 2018 and 2017, respectively. The Operating Partnership also conducts operations through eight other limited partnerships (the "Other Real Estate Partnerships"), numerous limited liability companies ("LLCs") and certain taxable REIT subsidiaries ("TRSs"), the operating data of which, together with that of the Operating Partnership, is consolidated with that of the Company as presented herein. The Operating Partnership holds at least a 99% limited partnership interest in each of the Other Real Estate Partnerships. The general partners of the Other Real Estate Partnerships are separate corporations, wholly-owned by the Company, each with at least a .01% general partnership interest in the Other Real Estate Partnerships. The Company does not have any significant assets or liabilities other than its investment in the Operating Partnership and its 100% ownership interest in the general partners of the Other Real Estate Partnerships. Noncontrolling interest in the Operating Partnership of approximately 2.0% and 3.2% at December 31, 2018 and 2017, respectively, represents the aggregate partnership interest held by the limited partners thereof ("Limited Partner Units" and together with the General Partner Units, the "Units") . We also own a 49% equity interest in, and provide various services to, a joint venture (the "Joint Venture") through a wholly owned subsidiary of the Operating Partnership. The Joint Venture is accounted for under the equity method of accounting. The operating data of the Joint Venture is not consolidated with that of the Company or the Operating Partnership as presented herein. Profits, losses and distributions of the Operating Partnership, the LLCs, the Other Real Estate Partnerships and the TRSs are allocated to the general partner and the limited partners, the members or the shareholders, as applicable, of such entities in accordance with the provisions contained within their respective organizational documents. As of December 31, 2018, we owned 458 industrial properties located in 21 states, containing an aggregate of approximately 63.1 million square feet of gross leasable area ("GLA"). Of the 458 properties owned on a consolidated basis, none of them are directly owned by the Company. Any references to the number of industrial properties and square footage in the financial statement footnotes are unaudited.

Organization

First Industrial Realty Trust, Inc. (the "Company") is a self-administered and fully integrated real estate company which owns, manages, acquires, sells, develops and redevelops industrial real estate. The Company is a Maryland corporation organized on August 10, 1993 and a real estate investment trust ("REIT") as defined in the Internal Revenue Code of 1986 (the "Code"). Unless stated otherwise or the context otherwise requires, the terms "we," "our" and "us" refer to the Company and its subsidiaries, including its operating partnership, First Industrial, L.P. (the "Operating Partnership"), and its consolidated subsidiaries.

We began operations on July 1, 1994. The Company's operations are conducted primarily through the Operating Partnership, of which the Company is the sole general partner (the "General Partner"), with an approximate 98.0% and 96.8% ownership interest ("General Partner Units") at December 31, 2018 and 2017, respectively. The Operating Partnership also conducts operations through eight other limited partnerships (the "Other Real Estate Partnerships"), numerous limited liability companies ("LLCs") and certain taxable REIT subsidiaries ("TRSs"), the operating data of which, together with that of the Operating Partnership, is consolidated with that of the Company as presented herein. The Operating Partnership holds at least a 99% limited partnership interest in each of the Other Real Estate Partnerships. The general partners of the Other Real Estate Partnerships are separate corporations, wholly-owned by the Company, each with at least a .01% general partnership interest in the Other Real Estate Partnerships. The Company does not have any significant assets or liabilities other than its investment in the Operating Partnership and its 100% ownership interest in the general partners of the Other Real Estate Partnerships. Noncontrolling interest in the Operating Partnership of approximately 2.0% and 3.2% at December 31, 2018 and 2017, respectively, represents the aggregate partnership interest held by the limited partners thereof ("Limited Partner Units" and together with the General Partner Units, the "Units") .

We also own a 49% equity interest in, and provide various services to, a joint venture (the "Joint Venture") through a wholly owned subsidiary of the Operating Partnership. The Joint Venture is accounted for under the equity method of accounting. The operating data of the Joint Venture is not consolidated with that of the Company or the Operating Partnership as presented herein.

Profits, losses and distributions of the Operating Partnership, the LLCs, the Other Real Estate Partnerships and the TRSs are allocated to the general partner and the limited partners, the members or the shareholders, as applicable, of such entities in accordance with the provisions contained within their respective organizational documents.

As of December 31, 2018, we owned 458 industrial properties located in 21 states, containing an aggregate of approximately 63.1 million square feet of gross leasable area ("GLA"). Of the 458 properties owned on a consolidated basis, none of them are directly owned by the Company.

Any references to the number of industrial properties and square footage in the financial statement footnotes are unaudited.