Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income		$ 3,493	$ 1,976	$ 1,322	$ 390
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment		1,252	(3,688)	2,503	(4,568)
Unrealized gain on cash flow hedges, net of tax expense of $0, $50, $0, and $238, respectively		496	147	78	698
Cash flow hedges reclassified to earnings, net of tax expense of $0, $0, $0, and $66, respectively		0	0	0	93
Reclassification of pension liability adjustments to earnings, net of tax expense of $2, $16, $4 and $32, respectively	[1]	41	50	81	99
Total comprehensive income (loss)		5,282	(1,515)	3,984	(3,288)
Less comprehensive (loss) income attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest		(38)	(34)	(57)	(54)
Foreign currency translation adjustment		29	(61)	33	24
Amounts attributable to noncontrolling interest		(9)	(95)	(24)	(30)
Comprehensive income (loss) attributable to L.B. Foster Company		$ 5,291	$ (1,420)	$ 4,008	$ (3,258)

[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.