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Retirement Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 contract
Defined Benefit Plan Disclosure [Line Items] |
Number of retirement plans | 7 fstr_NumberOfRetirementPlans
Defined Benefit Plan Number | 3 fstr_DefinedBenefitPlanNumber
Active Defined Benefit Plan Number | 1 fstr_ActiveDefinedBenefitPlanNumber
Inactive Defined Benefit Plan Number | 2 fstr_InactiveDefinedBenefitPlanNumber
Defined Contribution Plan Number | 4 fstr_DefinedContributionPlanNumber
Description of Postemployment Benefits | The Company sponsors seven defined contribution plans for hourly and salaried employees across our domestic and international facilities. The following table summarizes the expense associated with the contributions made to these plans.
United States Defined Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 0 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_UnitedStatesPensionPlansOfUSEntityDefinedBenefitMember
Canadian Employees [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Contribution Plan Number | 2 fstr_DefinedContributionPlanNumber / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fstr_CanadianEmployeesMember
United Kingdom Benefit Plans [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year | 270 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fstr_UnitedKingdomBenefitPlanMember
Defined Benefit Plan, Contributions by Employer | 69 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = fstr_UnitedKingdomBenefitPlanMember

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- Definition Number of active defined benefit plans offered by the company. + References No definition available. + Details
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Namespace Prefix: | fstr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defined benefit plans offered by the company. + References No definition available. + Details
Name: | fstr_DefinedBenefitPlanNumber
Namespace Prefix: | fstr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defined contribution plans offered by the company. + References No definition available. + Details
Name: | fstr_DefinedContributionPlanNumber
Namespace Prefix: | fstr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of inactive defined benefit plans offered by the company. + References No definition available. + Details
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Namespace Prefix: | fstr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of retirement plans offered by the company. + References No definition available. + Details
Name: | fstr_NumberOfRetirementPlans
Namespace Prefix: | fstr_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Description of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement, except for: a) benefits provided through a pension or postretirement benefit plan, b) individual deferred compensation arrangements, c) termination benefits pertaining to exit or disposal activities, and d) stock compensation plans. Benefits may be provided in cash or in kind and may be paid as a result of disability, layoff, death, or other event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 15 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6410066&loc=d3e79194-111664 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Nonretirement Postemployment Benefits -URI http://asc.fasb.org/extlink&oid=6518940 + Details
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- Details
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- Details
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Period Type: |

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- Details
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