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Goodwill and Other Intangibles (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2014 reporting_unit | Dec. 31, 2013
Number of reporting units | 2 |
Goodwill | $ 28,519 | $ 21,051
Fuel Chem Technology Segment [Member] |  |
Goodwill | 1,723 | 1,723
APC Technology Segment [Member] |  |
Goodwill | 26,796 | 19,328
Goodwill, Period Increase | $ 7,468 |

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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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