CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income		$ 35,898	$ 447	$ 43,120	$ 1,769
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		1,376	(1,651)	(590)	852
Unrealized (loss) gain on cash flow hedges, net of tax expense of $0		(698)	1	(778)	79
Reclassification of pension liability adjustments to earnings, net of tax expense of $7 and $2, respectively	[1]	24	42	75	123
Total comprehensive income (loss)		36,600	(1,161)	41,827	2,823
Less comprehensive (loss) income attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest		(7)	(68)	(68)	(125)
Foreign currency translation adjustment		18	(21)	(71)	12
Amounts attributable to noncontrolling interest		11	(89)	(139)	(113)
Comprehensive income (loss) attributable to L.B. Foster Company		$ 36,589	$ (1,072)	$ 41,966	$ 2,936

[1] Reclassifications out of “Accumulated other comprehensive loss” for pension obligations are charged to “Selling and administrative expenses” within the Condensed Consolidated Statements of Operations.