Accumulated Other Comprehensive Income (Changes in AOCI) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2025 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,746,028
Ending Balance	2,740,788
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	20,485
Other Comprehensive Loss Before Reclassifications	(3,949)
Amounts Reclassified from Accumulated Other Comprehensive Income	(11,118)
Net Current Period Other Comprehensive Loss	(15,067)
Ending Balance	5,418
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	386
Amounts Reclassified from Accumulated Other Comprehensive Income	0
Net Current Period Other Comprehensive Loss	386
Ending Balance	(163)
Accumulated Other Comprehensive Income of the Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	19,936
Other Comprehensive Loss Before Reclassifications	(3,563)
Amounts Reclassified from Accumulated Other Comprehensive Income	(11,118)
Net Current Period Other Comprehensive Loss	(14,681)
Ending Balance	5,255
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	(3,949)
Amounts Reclassified from Accumulated Other Comprehensive Income	(11,118)
Net Current Period Other Comprehensive Loss	(15,067)
Ending Balance	$ 5,418