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Accounts Receivable (Segment Trade Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net - segment $ 89,458us-gaap_AccountsReceivableNetCurrent $ 97,375us-gaap_AccountsReceivableNetCurrent
Rail Products Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net - segment 45,931us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_RailProductsSegmentMember		 57,342us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_RailProductsSegmentMember
Construction Products Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net - segment 33,760us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_ConstructionProductsSegmentMember		 35,711us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_ConstructionProductsSegmentMember
Tubular Products Segments [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable, net - segment $ 9,767us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_TubularProductsSegmentsMember		 $ 4,322us-gaap_AccountsReceivableNetCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= fstr_TubularProductsSegmentsMember