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Quarterly Data - Summary of Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, 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
Quarterly Financial Data [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
Net income (loss) (17,006) 1,016 5,561 9,506 4,510 3,396 3,604 4,734 (923) 16,244 12,660
Basic earnings (loss) per share $ (1.80) $ 0.11 $ 0.59 $ 1.01 $ 0.48 $ 0.36 $ 0.38 $ 0.51 $ (0.10) $ 1.73 $ 1.36
Diluted earnings (loss) per share $ (1.80) $ 0.11 $ 0.59 $ 1.00 $ 0.48 $ 0.36 $ 0.38 $ 0.50 $ (0.10) $ 1.72 $ 1.35
Operating Segments [Member]
                      
Quarterly Financial Data [Line Items]                      
Operating income (loss)                 15,500 44,613 46,773
Corporate [Member]
                      
Quarterly Financial Data [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)
Water Transmission [Member] | Operating Segments [Member]
                      
Quarterly Financial Data [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
Tubular Products [Member] | Operating Segments [Member]
                      
Quarterly Financial Data [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