CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net loss	$ 1,492	$ (2,117)
Other comprehensive income, net of tax:
Foreign currency translation adjustment	(1,037)	103
Unrealized gain (loss) on cash flow hedges, net of tax expense of $0	5	(266)
Total comprehensive income (loss)	460	(2,280)
Less comprehensive income attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest	(8)	(7)
Foreign currency translation adjustment	160	116
Amounts attributable to noncontrolling interest	152	109
Comprehensive income (loss) attributable to L.B. Foster Company	$ 308	$ (2,389)