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Business Segment, Geographic and Quarterly Financial Data - Reporting Segment Net Sales and Gross Margin (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenues from external customers | $ 79,017 us-gaap_Revenues | $ 109,338 us-gaap_Revenues | $ 97,644 us-gaap_Revenues
Cost of sales | (43,889)us-gaap_CostOfRevenue | (62,521)us-gaap_CostOfRevenue | (56,899)us-gaap_CostOfRevenue
Gross margin | 35,128 us-gaap_GrossProfit | 46,817 us-gaap_GrossProfit | 40,745 us-gaap_GrossProfit
Selling, general and administrative | (35,432)us-gaap_SellingGeneralAndAdministrativeExpense | (36,375)us-gaap_SellingGeneralAndAdministrativeExpense | (32,682)us-gaap_SellingGeneralAndAdministrativeExpense
Research and development | (1,459)us-gaap_ResearchAndDevelopmentExpense | (2,442)us-gaap_ResearchAndDevelopmentExpense | (2,863)us-gaap_ResearchAndDevelopmentExpense
Goodwill impairment | (23,400)us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
Operating (loss) income | (25,163)us-gaap_OperatingIncomeLoss | 8,000 us-gaap_OperatingIncomeLoss | 5,200 us-gaap_OperatingIncomeLoss
Air Pollution Control Segment |  |  |
Revenues from external customers | 42,031 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 72,552 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 62,441 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Cost of sales | (26,586)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | (45,138)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | (40,146)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Gross margin | 15,445 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 27,414 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 22,295 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Selling, general and administrative | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
Goodwill impairment | (23,400)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember |  |
Operating (loss) income | (7,955)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 27,414 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember | 22,295 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_AirPollutionControlSegmentMember
FUEL CHEM Segment |  |  |
Revenues from external customers | 36,986 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 36,786 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 35,203 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Cost of sales | (17,303)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | (17,383)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | (16,753)us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Gross margin | 19,683 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 19,403 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 18,450 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Selling, general and administrative | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Research and development | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Goodwill impairment | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember |
Operating (loss) income | 19,683 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 19,403 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember | 18,450 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_FuelChemSegmentMember
Other |  |  |
Revenues from external customers | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Cost of sales | 0 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_CostOfRevenue / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Gross margin | 0 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | 0 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Selling, general and administrative | (35,432)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (36,375)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (32,682)us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Research and development | (1,459)us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (2,442)us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | (2,863)us-gaap_ResearchAndDevelopmentExpense / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember
Goodwill impairment | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember |  |
Operating (loss) income | $ (36,891)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | $ (38,817)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember | $ (35,545)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = ftek_OtherSegmentsMember

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 2 -Article 5 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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