Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Goodwill [Line Items]
Goodwill, beginning balance	$ 220,163	$ 165,861
Goodwill, acquisitions and related adjustments	4,205	55,655
Goodwill, impairment charge	(53,762)
Goodwill, foreign currency translation	(453)	(1,353)
Goodwill, ending balance	170,153	220,163
Tradename, beginning balance	26,337	19,766
Tradename, acquisitions and related adjustments		10,280
Tradename, impairment charge	(4,161)	(3,340)
Tradename, foreign currency adjustments	(134)	(369)
Tradename, ending balance	22,042	26,337
Energy Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance	72,075	17,773
Goodwill, acquisitions and related adjustments	4,205	55,655
Goodwill, foreign currency translation	(453)	(1,353)
Goodwill, ending balance	75,827	72,075
Environmental Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance	55,031	55,031
Goodwill, impairment charge	(6,828)
Goodwill, ending balance	48,203	55,031
Fluid Handling and Filtration Segment [Member]
Goodwill [Line Items]
Goodwill, beginning balance	93,057	93,057
Goodwill, impairment charge	(46,934)
Goodwill, ending balance	$ 46,123	$ 93,057

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
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