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Long-Term Debt (Narrative) (Details) In Thousands, unless otherwise specified |  |  |  |  | 0 Months Ended |  |  | 3 Months Ended |
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 23, 2014 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A. and Citizens Bank of Pennsylvania [Member] Prior Revolving Credit Facility [Member] USD ($) | Mar. 13, 2015 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company [Member] Foreign Line of Credit [Member] USD ($) | Mar. 13, 2015 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company [Member] Revolving Credit Facility [Member] USD ($) | Mar. 31, 2015 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company [Member] Revolving Credit Facility [Member] USD ($) | Mar. 13, 2015 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A., Citizens Bank of Pennsylvania, and Branch Banking and Trust Company [Member] Revolving Credit Facility [Member] USD ($) | Mar. 31, 2015 NatWest Bank [Member] Foreign Line of Credit [Member] USD ($) | Mar. 31, 2015 NatWest Bank [Member] Foreign Line of Credit [Member] GBP (£) | Mar. 31, 2015 NatWest Bank Outstanding Guarantees [Member] Foreign Line of Credit [Member] USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Initiation Date |  |  |  |  | Mar. 13, 2015 |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 200,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember | $ 25,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember |  |  | $ 335,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember | $ 2,223 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankMember | £ 1,500 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankMember |
Debt Instrument, Term |  |  |  |  | 5 years |  |  |  |  |
Line of Credit Facility, Borrowing Capacity, Description |  |  |  |  | The Amended Credit Agreement provides for a five-year, unsecured revolving credit facility that permits borrowings of up to $335,000 for the U.S. borrowers and a sublimit of the equivalent of $25,000 U.S. dollars that is available to the Canadian borrowers. The Amended Credit Agreement's accordion feature permits the Company to increase the available revolving borrowings under the facility by up to an additional $100,000 subject to the Company's receipt of increased commitments from existing or new lenders and to certain conditions being satisfied. |  |  |  |  |
Line of Credit Facility, Provision for Increase in Capacity |  |  |  |  | 100,000 fstr_LineOfCreditFacilityProvisionForIncreaseInCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember |  |  |  |  |
Line of Credit Facility, Interest Rate Description |  |  |  |  | Borrowings under the Amended Credit Agreement will bear interest at rates based upon either the base rate or Euro-rate plus applicable margins. Applicable margins are dictated by the ratio of the Company's indebtedness less consolidated cash on hand to the Company's consolidated EBITDA, as defined in the underlying Amended Credit Agreement. The base rate is the highest of (a) PNC Bank's prime rate, (b) the Federal Funds Rate plus 0.50% or (c) the daily Euro-rate (as defined in the Amended Credit Agreement) plus 1.00%. The base rate and Euro-rate spreads range from 0.00% to 1.50% and 1.00% to 2.50%, respectively. |  |  | . The interest rate on this facility is the financial institution's base rate plus 1.50%. | . The interest rate on this facility is the financial institution's base rate plus 1.50%. |
Line of Credit Facility, Covenant Terms |  |  |  |  | The Amended Credit Agreement includes two financial covenants: (a) Leverage Ratio, defined as the Company's Indebtedness less consolidated cash on hand, in excess of $15,000, divided by the Company's consolidated EBITDA, which must not exceed 3.25 to 1.00 and (b) Minimum Interest Coverage, defined as consolidated EBITDA less Capital Expenditures divided by consolidated interest expense, which must be no less than 3.00 to 1.00. |  |  |  |  |
Line of Credit Facility, Dividend Restrictions |  |  |  |  | The Amended Credit Agreement permits the Company to pay dividends, distributions, and make redemptions with respect to its stock provided no event of default or potential default (as defined in the Amended Credit Agreement) has occurred prior to or after giving effect to the dividend, distribution, or redemption. Dividends, distributions, and redemptions are capped at $25,000 per year when funds are drawn on the facility. If no drawings on the facility exist, dividends, distributions, and redemptions in excess of $25,000 per year are subjected to a limitation of $75,000 in the aggregate over the life of the facility. The $75,000 aggregate limitation also permits certain loans, investments, and acquisitions. |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 216,261 us-gaap_LineOfCredit | 24,200 us-gaap_LineOfCredit |  |  |  | 425 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember |  |  |  | 20 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankOutstandingGuaranteesMember
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  |  | $ 118,314 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankN.a.BankOfAmericaN.a.WellsFargoBankN.a.CitizensBankOfPennsylvaniaAndBranchBankingAndTrustCompanyMember |  | $ 2,003 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankMember |  |
Line of Credit Facility, Collateral |  |  |  |  |  |  |  | This credit facility supports the subsidiary's working capital requirements and is collateralized by substantially all of the assets of its United Kingdom operations. | This credit facility supports the subsidiary's working capital requirements and is collateralized by substantially all of the assets of its United Kingdom operations. |
Line of Credit Facility, Expiration Date |  |  |  |  | Mar. 13, 2020 |  |  |  |  |

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- Definition Amount of increase in the revolver facility available provided by the credit agreement as long as no event of default exists. + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Description of the credit facility's borrowing capacity including discussion of how the borrowing capacity is determined (for example, borrowing capacity based on the amount of current assets). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Discussion of whether the borrowings under the credit facility are secured or unsecured and, if secured, a description of collateral (for example, accounts receivable less than 120 days old, finished goods inventory). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(b)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of restrictions on the entity's ability to pay dividends as required by the terms of the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Date the credit facility first became available, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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