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Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Property and equipment additions	$ 90	$ 297	$ 801	$ 533
Depreciation and amortization	2,714	1,888	8,103	3,201
Identifiable Assets	350,552		350,552		348,536
Air Pollution Control Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	59	66	327	160
Depreciation and amortization	508	295	1,286	793
Identifiable Assets	86,858		86,858		74,556
Energy Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	5	231	72	373
Depreciation and amortization	561	782	1,780	1,515
Identifiable Assets	67,598		67,598		76,960
Fluid Handling Filtration Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	26		359
Depreciation and amortization	1,614	771	4,939	787
Identifiable Assets	177,393		177,393		185,646
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions			43
Depreciation and amortization	31	40	98	106
Identifiable Assets	$ 18,703		$ 18,703		$ 11,374

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

+ Details

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Period Type:	instant

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ 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

+ Details

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X

- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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X

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