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Segment Information - Segment Information Report of Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Net sales $ 115,199 $ 103,022 $ 116,738 $ 140,597 $ 136,188 $ 115,099 $ 131,041 $ 142,175 $ 475,556 $ 524,503 $ 511,668
Gross profit 6,775 8,812 15,668 21,204 14,521 11,600 13,577 16,500 52,459 56,198 59,138
Operating income (loss) (26,291) 2,840 9,380 14,820 7,382 4,029 6,970 9,179 749 27,560 32,823
Depreciation and amortization of property and equipment                 13,299 16,267 14,521
Capital expenditures                 28,447 16,789 16,333
Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 15,500 44,613 46,773
Depreciation and amortization of property and equipment                 13,045 16,015 14,452
Capital expenditures                 27,558 16,643 16,151
Corporate [Member]
                      
Segment Reporting Information [Line Items]                      
Operating income (loss) (3,309) (3,559) (4,004) (3,879) (4,127) (4,074) (3,811) (5,041) (14,751) (17,053) (13,950)
Depreciation and amortization of property and equipment                 254 252 69
Capital expenditures                 889 146 182
Reportable Geographical Components [Member] | United States [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales                 441,779 473,403 455,625
Reportable Geographical Components [Member] | Other [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales                 33,777 51,100 56,043
Water Transmission [Member] | Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales 42,831 46,835 58,148 78,613 88,235 63,487 59,050 58,431 226,427 269,203 271,885
Gross profit 7,026 7,932 12,125 19,870 17,522 9,681 8,149 9,699 46,953 45,051 43,182
Operating income (loss) 5,505 6,306 10,499 18,033 15,155 6,969 6,130 8,024 40,343 36,278 34,113
Depreciation and amortization of property and equipment                 7,082 10,474 8,729
Capital expenditures                 13,204 6,830 4,765
Tubular Products [Member] | Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Net sales 72,368 56,187 58,590 61,984 47,953 51,612 71,991 83,744 249,129 255,300 239,783
Gross profit (251) 880 3,543 1,334 (3,001) 1,919 5,428 6,801 5,506 11,147 15,956
Operating income (loss) (28,487) 93 2,885 666 (3,646) 1,134 4,651 6,196 (24,843) 8,335 12,660
Depreciation and amortization of property and equipment                 5,963 5,541 5,723
Capital expenditures                 $ 14,354 $ 9,813 $ 11,386