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Segment Information - Segment Information Report of Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Operating Segments [Member] | Dec. 31, 2012 Operating Segments [Member] | Dec. 31, 2013 Corporate [Member] | Dec. 31, 2012 Corporate [Member] | Dec. 31, 2013 Water Transmission [Member] Operating Segments [Member] | Dec. 31, 2012 Water Transmission [Member] Operating Segments [Member] | Dec. 31, 2011 Water Transmission [Member] Operating Segments [Member] | Dec. 30, 2013 Tubular Products [Member] | Dec. 31, 2013 Tubular Products [Member] Operating Segments [Member] | Dec. 31, 2012 Tubular Products [Member] Operating Segments [Member] | Dec. 31, 2011 Tubular Products [Member] Operating Segments [Member]
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 25,760 | $ 20,478 | $ 20,478 |  |  |  |  | $ 5,282 |  |  | $ 20,500 | $ 20,478 | $ 20,478 | $ 20,478
Assets | $ 433,459 | $ 422,422 |  | $ 402,937 | $ 396,578 | $ 30,522 | $ 25,844 | $ 218,849 | $ 221,987 |  |  | $ 184,088 | $ 174,591 |

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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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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