Accumulated Other Comprehensive Income (Changes in AOCI) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2025 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,746,028
Ending Balance	2,734,393
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	20,485
Other Comprehensive Loss Before Reclassifications	(5,533)
Amounts Reclassified from Accumulated Other Comprehensive Income	(7,368)
Net Current Period Other Comprehensive Loss	(12,901)
Ending Balance	7,584
Comprehensive (Loss) Income Attributable to Noncontrolling Interest of the Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(549)
Other Comprehensive Loss Before Reclassifications	321
Amounts Reclassified from Accumulated Other Comprehensive Income	0
Net Current Period Other Comprehensive Loss	321
Ending Balance	(228)
Accumulated Other Comprehensive Income of the Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	19,936
Other Comprehensive Loss Before Reclassifications	(5,212)
Amounts Reclassified from Accumulated Other Comprehensive Income	(7,368)
Net Current Period Other Comprehensive Loss	(12,580)
Ending Balance	7,356
First Industrial, L.P. \| Accumulated Other Comprehensive Income of the Operating Partnership
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	20,485
Other Comprehensive Loss Before Reclassifications	(5,533)
Amounts Reclassified from Accumulated Other Comprehensive Income	(7,368)
Net Current Period Other Comprehensive Loss	(12,901)
Ending Balance	$ 7,584

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.

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