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Goodwill and Other Intangibles (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |  |  |  | 9 Months Ended |  | 0 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 reporting_unit | Dec. 31, 2013 | Sep. 30, 2014 Fuel Chem Technology Segment [Member] | Dec. 31, 2013 Fuel Chem Technology Segment [Member] | Sep. 30, 2014 APC Technology Segment [Member] | Dec. 31, 2013 APC Technology Segment [Member] | Sep. 18, 2014 Intellectual Property [Member] | Sep. 30, 2014 PECO and FGC Acquisitions [Member] | Apr. 30, 2014 PECO and FGC Acquisitions [Member] Other Intangible Assets [Member]
Number of reporting units | 2 |  |  |  |  |  |  |  |
Goodwill | $ 26,139 | $ 21,051 | $ 1,723 | $ 1,723 | $ 24,416 | $ 19,328 |  | $ 5,088 |
Goodwill, Period Increase |  |  |  |  | 5,088 |  |  |  |
Other intangible assets, net | 10,616 | 4,305 |  |  |  |  |  |  |
Identifiable intangible assets |  |  |  |  |  |  |  | 4,126 | 4,126
Finite-lived intangible assets acquired |  |  |  |  |  |  | $ 3,010 |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing 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 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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