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Construction Contracts in Progress - Summary of Contracts in Progress (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Summary of Contracts in Progress [Abstract] |  |
Costs incurred on uncompleted contracts | $ 92,190 ftek_CostsIncurredOnUncompletedContracts | $ 74,242 ftek_CostsIncurredOnUncompletedContracts
Estimated earnings | 47,510 ftek_EstimatedEarningsForContractsInProgress | 41,130 ftek_EstimatedEarningsForContractsInProgress
Earned revenue | 139,700 ftek_EarnedRevenueForContractsInProgress | 115,372 ftek_EarnedRevenueForContractsInProgress
Less billings to date | (132,790)us-gaap_BilledContractReceivables | (104,679)us-gaap_BilledContractReceivables
Total | 6,910 us-gaap_UnbilledContractsReceivable | 10,693 us-gaap_UnbilledContractsReceivable
Classified as follows: |  |
Costs and estimated earnings in excess of billings on uncompleted contracts | 9,904 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms | 11,899 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Billings in excess of costs and estimated earnings on uncompleted contracts | $ (2,994)us-gaap_BillingsInExcessOfCost | $ (1,206)us-gaap_BillingsInExcessOfCost

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- Definition Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party. An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57788-111642 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57807-111642 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 35 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802688&loc=d3e57795-111642 + Details
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