CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income		$ 42,843	$ 1,299
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		(2,887)	2,428
Unrealized loss on cash flow hedges, net of tax benefit of $203 and $0, respectively		(593)	(704)
Pension and post-retirement benefit plans benefit, net of tax benefit $0		0	152
Reclassification of pension liability adjustments to earnings, net of tax expense of $424 and $0, respectively*	[1]	1,014	39
Total comprehensive income		40,377	3,214
Less comprehensive loss attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest		(103)	(165)
Foreign currency translation adjustment		77	29
Amounts attributable to noncontrolling interest		(26)	(136)
Comprehensive income attributable to L.B. Foster Company		$ 40,403	$ 3,350

[1] Reclassifications out of Accumulated other comprehensive loss for pension obligations are reflected in Selling and administrative expense and pension settlement costs are reflected in Other expense - net .