Goodwill and Intangible Assets - Goodwill / Tradename (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Goodwill [Line Items]
Goodwill, beginning balance	$ 134,062us-gaap_Goodwill	$ 19,548us-gaap_Goodwill
Goodwill, acquisitions and related adjustments	34,638us-gaap_GoodwillAcquiredDuringPeriod	114,321us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, foreign currency translation	(1,153)us-gaap_GoodwillTranslationAdjustments	193us-gaap_GoodwillTranslationAdjustments
Goodwill, ending balance	167,547us-gaap_Goodwill	134,062us-gaap_Goodwill
Tradename, beginning balance	18,419	3,526
Tradename, acquisitions and related adjustments	1,730	14,775
Tradename, foreign currency adjustments	(383)	118
Tradename, ending balance	19,766	18,419
Air Pollution Control Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance	22,657	12,932
Goodwill, acquisitions and related adjustments	30,881	9,725
Goodwill, ending balance	53,538	22,657
Energy Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance	14,174	6,386
Goodwill, acquisitions and related adjustments	3,757	7,595
Goodwill, foreign currency translation	(1,153)	193
Goodwill, ending balance	16,778	14,174
Fluid Handling Filtration Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance		230
Goodwill, acquisitions and related adjustments		97,001
Goodwill, ending balance	$ 97,231	$ 97,231

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.

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

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+ References

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

-Publisher FASB

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-Publisher FASB

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