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Long-Term Debt and Related Matters (Narrative) (Details) In Thousands, unless otherwise specified |  |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  |
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2014 Letter of Credit [Member] USD ($) | Dec. 31, 2013 Letter of Credit [Member] USD ($) | Dec. 31, 2013 Prior Revolving Credit Facility [Member] USD ($) | Sep. 23, 2014 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A. and Citizens Bank of Pennsylvania [Member] Revolving Credit Facility [Member] USD ($) | Dec. 31, 2014 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A. and Citizens Bank of Pennsylvania [Member] Revolving Credit Facility [Member] USD ($) | Sep. 23, 2014 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A. and Citizens Bank of Pennsylvania [Member] Revolving Credit Facility [Member] USD ($) | Dec. 31, 2014 PNC Bank, N.A., Bank of America, N.A., Wells Fargo Bank, N.A. and Citizens Bank of Pennsylvania [Member] Revolving Credit Facility Available To Canadian Borrowers [Member] USD ($) | Dec. 31, 2014 NatWest Bank [Member] Foreign Line of Credit [Member] USD ($) | Dec. 31, 2014 NatWest Bank [Member] Foreign Line of Credit [Member] GBP (£) | Dec. 31, 2013 NatWest Bank [Member] Foreign Line of Credit [Member] USD ($) | Dec. 31, 2014 NatWest Bank Outstanding Guarantees [Member] Foreign Line of Credit [Member] USD ($) | Dec. 31, 2013 NatWest Bank Outstanding Guarantees [Member] Foreign Line of Credit [Member] USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 125,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember |  |  | $ 200,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember | $ 25,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = fstr_RevolvingCreditFacilityAvailableToCanadianBorrowersMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember | $ 2,337 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, Description |  |  |  |  |  |  |  |  |  | A subsidiary of the Company has a working capital facility with NatWest Bank for its United Kingdom operations which includes an overdraft availability of £1,500 pounds sterling (approximately $2,337 at December 31, 2014). This credit facility supports the subsidiary's working capital requirements and is collateralized by substantially all of the assets of its United Kingdom operations | A subsidiary of the Company has a working capital facility with NatWest Bank for its United Kingdom operations which includes an overdraft availability of £1,500 pounds sterling (approximately $2,337 at December 31, 2014). 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, Provision for Increase in Capacity |  |  |  |  | 50,000 fstr_LineOfCreditFacilityProvisionForIncreaseInCapacity / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember | 100,000 fstr_LineOfCreditFacilityProvisionForIncreaseInCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember |  |  |  |  |  |  |  |
Line of Credit Facility, Capacity Available for Trade Purchases |  |  |  |  | 20,000 us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember |  |  | 30,000 us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember |  |  |  |  |  |
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 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 1.00% and 1.00% to 2.00%, 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 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. The $75,000 aggregate limitation also permits certain loans, investments, and acquisitions. |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | 24,200 us-gaap_LineOfCredit | 0 us-gaap_LineOfCredit | 425 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 814 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember |  | 24,200 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember |  |  |  |  |  | 0 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankOutstandingGuaranteesMember | 60 us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankOutstandingGuaranteesMember
Line of Credit Facility, Current Borrowing Capacity |  |  |  |  | $ 124,186 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = fstr_PriorRevolvingCreditFacilityMember |  | $ 175,375 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = fstr_PncBankNBankOfAmericaNWellsFargoBankNAndCitizensBankOfPennsylvaniaMember |  |  | $ 2,337 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_ForeignLineOfCreditMember / us-gaap_LineOfCreditFacilityAxis = fstr_NatwestBankMember |  | $ 2,424 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, Covenant Compliance |  |  |  |  |  |  | As of December 31, 2014, the Company was in compliance with the Amended Credit Agreement's covenants |  |  | The United Kingdom loan agreements contain certain financial covenants that require that subsidiary to maintain senior interest and cash flow coverage ratios. The subsidiary was in compliance with these financial covenants as of December 31, 2014 a | The United Kingdom loan agreements contain certain financial covenants that require that subsidiary to maintain senior interest and cash flow coverage ratios. The subsidiary was in compliance with these financial covenants as of December 31, 2014 a |  |  |

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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 The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for financing purchases of goods acquired for inventory or imminent delivery to a customer. + References No definition available. + 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 Identification of whether the entity has been in compliance with any credit facility debt covenants during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 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 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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