Segment Information - Segment Information Report of Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Net sales	$ 84,865us-gaap_SalesRevenueNet	$ 82,647us-gaap_SalesRevenueNet
Gross profit (loss)	3,891us-gaap_GrossProfit	4,314us-gaap_GrossProfit
Operating income (loss)	(3,083)us-gaap_OperatingIncomeLoss	(1,126)us-gaap_OperatingIncomeLoss
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(4,099)	(3,121)
Water Transmission [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	56,242	42,999
Gross profit (loss)	7,519	1,668
Operating income (loss)	5,633	(299)
Tubular Products [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales	28,623	39,648
Gross profit (loss)	(3,628)	2,646
Operating income (loss)	$ (4,617)	$ 2,294

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

Name:	us-gaap_GrossProfit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_OperatingIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_PublicUtilitiesInventoryTubularGoodsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=us-gaap_WaterTransmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: