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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property and equipment additions	$ 1,348	$ 185	$ 5,196	$ 526
Depreciation and amortization	4,689	4,274	15,017	11,217
Identifiable Assets	561,958		561,958		$ 598,819
Environmental Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	4	49	232	130
Depreciation and amortization	994	1,092	2,868	3,349
Identifiable Assets	122,350		122,350		135,171
Energy Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	225	66	529	245
Depreciation and amortization	2,341	1,526	8,082	2,957
Identifiable Assets	263,059		263,059		283,002
Fluid Handling and Filtration Segment [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	1,118	65	4,428	133
Depreciation and amortization	1,321	1,586	3,969	4,772
Identifiable Assets	155,143		155,143		161,394
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Property and equipment additions	1	5	7	18
Depreciation and amortization	33	$ 70	98	$ 139
Identifiable Assets	$ 21,406		$ 21,406		$ 19,252

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=66902209&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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X

- 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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