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