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Segment Information - Segment Information Report of Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 101,988 | $ 87,942 | $ 184,635 | $ 195,277
Gross profit (loss) | 11,317 | 15,210 | 15,631 | 38,129
Operating income (loss) | 5,399 | 9,269 | 4,273 | 26,158
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | (3,555) | (4,004) | (6,676) | (7,883)
Water Transmission [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 62,205 | 58,148 | 105,204 | 136,761
Gross profit (loss) | 11,491 | 12,125 | 13,159 | 31,995
Operating income (loss) | 9,543 | 10,499 | 9,244 | 28,532
Tubular Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 39,783 | 29,794 | 79,431 | 58,516
Gross profit (loss) | (174) | 3,085 | 2,472 | 6,134
Operating income (loss) | $ (589) | $ 2,774 | $ 1,705 | $ 5,509

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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