Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income		$ 1,976	$ 2,854	$ 390	$ 1,584
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment		(3,688)	538	(4,568)	961
Unrealized gain on cash flow hedges, net of tax expense of $50, $0, $238,and $0, respectively		147	0	698	0
Cash flow hedges reclassified to earnings, net of tax expense of $0, $98, $66, and $196, respectively		0	137	93	273
Reclassification of pension liability adjustments to earnings, net of tax expense of $16, $24, $32, and $48, respectively*	[1]	50	91	99	182
Total comprehensive (loss) income		(1,515)	3,620	(3,288)	3,000
Less comprehensive income (loss) attributable to noncontrolling interest:
Net loss attributable to noncontrolling interest		(34)	(22)	(54)	(34)
Foreign currency translation adjustment		(61)	51	24	21
Amounts attributable to noncontrolling interest		(95)	29	(30)	(13)
Comprehensive (loss) income attributable to L.B. Foster Company		$ (1,420)	$ 3,591	$ (3,258)	$ 3,013

[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.