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Segment Information - Segment Information Report of Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 103,022 | $ 115,099 | $ 360,357 | $ 388,315
Gross profit | 8,812 | 11,600 | 45,684 | 41,677
Operating income (loss) | 2,840 | 4,029 | 27,040 | 20,178
Water Transmission [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 46,835 | 63,487 | 183,596 | 180,968
Gross profit | 7,932 | 9,681 | 39,927 | 27,529
Operating income (loss) | 6,306 | 6,969 | 34,838 | 21,123
Tubular Products [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 56,187 | 51,612 | 176,761 | 207,347
Gross profit | 880 | 1,919 | 5,757 | 14,148
Operating income (loss) | 93 | 1,134 | 3,644 | 11,981
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating income (loss) | $ (3,559) | $ (4,074) | $ (11,442) | $ (12,926)

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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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