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Business Segments (Assets by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 695,726us-gaap_Assets $ 495,121us-gaap_Assets
Less: LIFO reserve (8,295)us-gaap_InventoryLIFOReserve (8,289)us-gaap_InventoryLIFOReserve
Rail Products and Services Segment [Member]    
Segment Reporting Information [Line Items]    
Assets 248,870us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_RailProductsSegmentMember		 239,951us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_RailProductsSegmentMember
Construction Products Segment [Member]    
Segment Reporting Information [Line Items]    
Assets 93,617us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_ConstructionProductsSegmentMember		 102,978us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_ConstructionProductsSegmentMember
Tubular and Energy Services Segments [Member]    
Segment Reporting Information [Line Items]    
Assets 323,472us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_TubularProductsSegmentsMember		 130,289us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_TubularProductsSegmentsMember
Unallocated Corporate Assets [Member]    
Segment Reporting Information [Line Items]    
Assets $ 38,062us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember		 $ 30,192us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CorporateMember