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)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ 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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- Details

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