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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

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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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