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Acquisitions (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 189,200 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 495 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |
Business Acquisition, Transaction Costs | 370 us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts |  |  |  |  |  |
Inspection Oilfield Services (IOS) [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Mar. 13, 2015 |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  | IOS Holdings, Inc. |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | 166,933 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Working capital adjustment |  |  | 2,834 fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Earn-out provision proceeds |  |  | 60,000 fstr_EarnOutProvisionProceeds / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  | 7,600 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Tew Holdings, LTD [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Jan. 13, 2015 |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  | Tew Holdings, LTD (Tew) |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  | 26,424 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Working capital adjustment |  |  |  | 4,156 fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  |  | 600 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Dec. 30, 2014 |  |
Business Acquisition, Name of Acquired Entity |  |  |  |  | Chemtec Energy Services, L.L.C. (Chemtec) |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | 66,719 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Working capital adjustment |  |  |  |  | 1,867 fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  |  |  | 5,000 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
FWO [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  | Oct. 29, 2014 |
Business Acquisition, Name of Acquired Entity |  |  |  |  |  | FWO |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  | 1,103 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Working capital adjustment |  |  |  |  |  | 161 fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Carr Concrete [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  |  | Jul. 07, 2014
Business Acquisition, Name of Acquired Entity |  |  |  |  |  |  | Carr Concrete Corporation (Carr)
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  |  |  | 12,480 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Working capital adjustment |  |  |  |  |  |  | 189 fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Business Combination, Indemnification Assets, Amount as of Acquisition Date |  |  |  |  |  |  | $ 1,000 us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember

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