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Business Segment Information - Goodwill (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill
Goodwill	$ 169,324	$ 167,547	$ 134,062
Air Pollution Control Segment [Member]
Goodwill
Goodwill	55,033	53,538
Energy Segment [Member]
Goodwill
Goodwill	17,060	16,778
Fluid Handling and Filtration Segment [Member]
Goodwill
Goodwill	$ 97,231	$ 97,231

X

- 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=35741047&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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Period Type:	instant

X

- References

No definition available.

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- Details

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