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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	$ 189,200us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	$ 495us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Business Acquisition, Transaction Costs	370us-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			166,933us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember
Working capital adjustment			2,834fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember
Earn-out provision proceeds			60,000fstr_EarnOutProvisionProceeds / us-gaap_BusinessAcquisitionAxis = fstr_InspectionOilfieldServicesIosMember
Business Combination, Indemnification Assets, Amount as of Acquisition Date			7,600us-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				26,424us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember
Working capital adjustment				4,156fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_TewHoldingsLtdMember
Business Combination, Indemnification Assets, Amount as of Acquisition Date				600us-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					66,719us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember
Working capital adjustment					1,867fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_ChemtecEnergyServicesLlcMember
Business Combination, Indemnification Assets, Amount as of Acquisition Date					5,000us-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						1,103us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_FwoMember
Working capital adjustment						161fstr_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							12,480us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Working capital adjustment							189fstr_WorkingCapitalAdjustment / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember
Business Combination, Indemnification Assets, Amount as of Acquisition Date							$ 1,000us-gaap_BusinessCombinationIndemnificationAssetsAmountAsOfAcquisitionDate / us-gaap_BusinessAcquisitionAxis = fstr_CarrConcreteMember

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Amount of additional proceeds provided to the seller with the achievement of the earn-out provisions associated with the sale agreement.

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Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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