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Acquisitions (Allocation of Purchase Price) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 13, 2015 | Jan. 13, 2015 | Dec. 30, 2014 | Oct. 29, 2014 | Jul. 07, 2014
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 215,130 us-gaap_Goodwill | $ 82,949 us-gaap_Goodwill |  |  |  |  |
Inspection Oilfield Services (IOS) [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  | 19,104 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Other assets |  |  | 90 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Property, plant and equipment |  |  | 47,968 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Goodwill |  |  | 123,412 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Other intangibles |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Liabilities assumed |  |  | (22,341)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Total |  |  | 168,233 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember |  |  |  |
Tew Holdings, LTD [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  | 11,957 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Other assets |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Property, plant and equipment |  |  |  | 2,398 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Goodwill |  |  |  | 9,079 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Other intangibles |  |  |  | 14,048 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Liabilities assumed |  |  |  | (6,647)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Total |  |  |  | 30,835 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember |  |  |
Chemtec Energy Services, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  | 15,528 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Other assets |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Property, plant and equipment |  |  |  |  | 4,705 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Goodwill |  |  |  |  | 22,302 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Other intangibles |  |  |  |  | 33,130 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Liabilities assumed |  |  |  |  | (6,756)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
Total |  |  |  |  | 68,909 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember |  |
FWO [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  |  | 131 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Other assets |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Property, plant and equipment |  |  |  |  |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Goodwill |  |  |  |  |  | 971 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Other intangibles |  |  |  |  |  | 419 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Liabilities assumed |  |  |  |  |  | (418)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Total |  |  |  |  |  | 1,103 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember |
Carr Concrete [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | 3,180 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Other assets |  |  |  |  |  |  | 45 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Property, plant and equipment |  |  |  |  |  |  | 7,648 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Goodwill |  |  |  |  |  |  | 1,936 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Other intangibles |  |  |  |  |  |  | 1,348 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Liabilities assumed |  |  |  |  |  |  | (1,677)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Total |  |  |  |  |  |  | $ 12,480 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember

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