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Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Unvested Restricted Stock / Unit Awards 287,273 410,132
First Industrial, L.P.    
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]    
Unvested Restricted Stock / Unit Awards 407,457 410,132