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Goodwill and Intangible Assets - Schedule of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2013
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, 2011
Tubular Products [Member]
Operating Segments [Member]
Goodwill [Line Items]              
Goodwill, Beginning Balance $ 20,478 $ 20,478       $ 20,500 $ 20,478 $ 20,478
Additions 5,282   5,282         
Goodwill, Ending Balance $ 25,760 $ 20,478 $ 5,282    $ 20,500 $ 20,478 $ 20,478