{"cik":1033128,"taxonomy":"us-gaap","tag":"OperatingLeaseRightOfUseAsset","label":"Operating Lease, Right-of-Use Asset","description":"Amount of lessee's right to use underlying asset under operating lease.","entityName":"FIRST INDUSTRIAL REALTY TRUST, INC.","units":{"USD":[{"end":"2025-12-31","val":19589000,"accn":"0000921825-26-000075","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-10-22","frame":"CY2025Q4I"},{"end":"2026-09-30","val":18973000,"accn":"0000921825-26-000075","fy":2026,"fp":"Q3","form":"10-Q","filed":"2026-10-22","frame":"CY2026Q3I"}]}}