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Business Segment Information - Property and Equipment Additions, Depreciation and Amortization and Identifiable Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Property and equipment additions | $ 1,028 | $ 5,461 | $ 763
Depreciation and amortization | 16,088 | 18,903 | 16,520
Identifiable assets | 438,549 | 498,634 |
Environmental Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment additions | 166 | 404 | 166
Depreciation and amortization | 3,297 | 3,816 | 4,443
Identifiable assets | 107,910 | 118,680 |
Energy Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment additions | 438 | 569 | 429
Depreciation and amortization | 7,866 | 9,555 | 5,293
Identifiable assets | 217,033 | 257,566 |
Fluid Handling and Filtration Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment additions | 382 | 4,481 | 150
Depreciation and amortization | 4,754 | 5,406 | 6,331
Identifiable assets | 100,916 | 104,294 |
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Property and equipment additions | 42 | 7 | 18
Depreciation and amortization | 171 | 126 | $ 453
Identifiable assets | $ 12,690 | $ 18,094 |

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- 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 + Details
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- 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 + Details
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- 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. + Details
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