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Investments (Schedule Of Carrying Amount And Maximum Loss Exposure Of Equity Investments) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Schedule of Equity Method Investments [Line Items] |  |
Equity method investment | $ 5,907 us-gaap_EquityMethodInvestments | $ 5,824 us-gaap_EquityMethodInvestments
LB Pipe & Coupling Products, LLC [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investment | 5,845 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember | 5,746 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember
Net investment in direct financing lease | 1,087 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember | 1,117 us-gaap_CapitalLeasesNetInvestmentInDirectFinancingLeases / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember
Maximum exposure to loss | $ 6,932 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember | $ 6,863 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = fstr_LbPipeCouplingProductsLlcMember

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- Definition The net investment in direct financing leases as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496975&loc=d3e45377-112738 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 + Details
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- Details
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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
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- Details
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