Earnings Per Share / Unit (EPS / EPU) - Additional Information (Details) - shares	Jun. 30, 2026	Jun. 30, 2025
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested Restricted Stock / Unit Awards	69,636	83,358
First Industrial, L.P.
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Unvested Restricted Stock / Unit Awards	199,646	203,746

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
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