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Business Segment Information - Goodwill (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill
Goodwill	$ 220,163	$ 165,861	$ 129,888
Environmental Segment [Member]
Goodwill
Goodwill	55,031	55,031	22,657
Energy Segment [Member]
Goodwill
Goodwill	72,075	17,773	$ 14,174
Fluid Handling and Filtration Segment [Member]
Goodwill
Goodwill	$ 93,057	$ 93,057

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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=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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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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- Details

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- Details

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