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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]
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