Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock/Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Stock / Unit Awards	296,371	405,436
Restricted Stock/Unit Awards | Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Stock / Unit Awards	296,371	405,436	408,248
First Industrial, L.P.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Restricted Stock / Unit Awards	421,928	405,436	408,248