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Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Property and equipment additions	$ 165	$ 1,348	$ 806	$ 5,196
Depreciation and amortization	3,937	4,689	12,105	15,017
Identifiable Assets	455,543		455,543		$ 498,634
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	68	225	110	529
Depreciation and amortization	813	994	2,500	2,868
Identifiable Assets	106,373		106,373		118,680
Energy Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	69	4	419	232
Depreciation and amortization	1,927	2,341	5,957	8,082
Identifiable Assets	234,575		234,575		257,566
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	17	1,118	236	4,428
Depreciation and amortization	1,168	1,321	3,563	3,969
Identifiable Assets	102,485		102,485		104,294
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	11	1	41	7
Depreciation and amortization	29	$ 33	85	$ 98
Identifiable Assets	$ 12,110		$ 12,110		$ 18,094

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 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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=98514028&loc=d3e3602-108585

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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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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