Northwest Pipe (NWPX) 10-K 17 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 12, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'NWPX	'	'
Entity Registrant Name	'NORTHWEST PIPE CO	'	'
Entity Central Index Key	'0001001385	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	9,508,875	'
Entity Public Float	'	'	$222,710,746

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]	'	'	'
Net sales	$475,556	$524,503	$511,668
Cost of sales	423,097	468,305	452,530
Gross profit	52,459	56,198	59,138
Selling, general and administrative expense	24,210	28,638	26,315
Impairment of fixed assets	27,500	'	'
Operating income	749	27,560	32,823
Other expense	289	339	1,338
Interest income	-456	-160	-99
Interest expense	3,965	5,616	9,306
Income (loss) before income taxes	-3,049	21,765	22,278
Provision for (benefit from) income taxes	-2,126	5,521	9,618
Net income (loss)	($923)	$16,244	$12,660
Basic earnings (loss) per share	($0.10)	$1.73	$1.36
Diluted earnings (loss) per share	($0.10)	$1.72	$1.35
Shares used in per share calculations:	'	'	'
Basic	9,445	9,377	9,333
Diluted	9,445	9,445	9,384

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Net income (loss)	($923)	$16,244	$12,660
Other comprehensive income (loss):	'	'	'
Pension liability adjustment, net of tax	913	138	-667
Deferred gain (loss) on cash flow derivatives, net of tax	99	-99	211
Other comprehensive income (loss)	1,012	39	-456
Comprehensive income	$89	$16,283	$12,204

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$588	$46
Trade and other receivables, less allowance for doubtful accounts of $685 and $1,748	72,470	41,498
Costs and estimated earnings in excess of billings on uncompleted contracts	50,468	73,314
Inventories	110,392	113,545
Refundable income taxes	1,073	'
Deferred income taxes	6,208	5,177
Prepaid expenses and other	2,381	2,558
Total current assets	243,580	236,138
Property and equipment, net	143,061	152,545
Goodwill	25,760	20,478
Other assets	21,058	13,261
Total assets	433,459	422,422
Current liabilities:	'	'
Current portion of long-term debt	5,714	5,714
Current portion of capital lease obligations	2,216	3,295
Accounts payable	21,731	21,042
Accrued liabilities	10,302	23,424
Deferred revenue	4,892	8,793
Billings in excess of costs and estimated earnings on uncompleted contracts	3,368	6,478
Total current liabilities	48,223	68,746
Note payable to financial institution	87,919	47,533
Long-term debt, less current portion	643	6,357
Capital lease obligations, less current portion	5,679	9,179
Deferred income taxes	11,842	15,254
Pension and other long-term liabilities	17,303	15,921
Total liabilities	171,609	162,990
Commitments and contingencies (Note 14)	'	'
Stockholders' equity:	'	'
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding	'	'
Common stock, $.01 par value, 15,000,000 shares authorized, 9,449,299 and 9,382,994 shares issued and outstanding	94	94
Additional paid-in-capital	114,559	112,230
Retained earnings	148,458	149,381
Accumulated other comprehensive loss	-1,261	-2,273
Total stockholders' equity	261,850	259,432
Total liabilities and stockholders' equity	$433,459	$422,422

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Trade and other receivables, allowance for doubtful accounts	$685	$1,748
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	'	'
Preferred stock, shares outstanding	'	'
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	9,449,299	9,382,994
Common stock, shares outstanding	9,449,299	9,382,994

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss) Income [Member]
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2010	$226,292	$93	$107,578	$120,477	($1,856)
Balance, Shares at Dec. 31, 2010	'	9,298,156	'	'	'
Net income (loss)	12,660	'	'	12,660	'
Other comprehensive (loss) income:	'	'	'	'	'
Foreign currency cash flow hedge, net of tax expense	211	'	'	'	211
Pension liability adjustment, net of tax benefit	-667	'	'	'	-667
Issuance of common stock under stock compensation plans	67	1	66	'	'
Issuance of common stock under stock compensation plans, shares	'	55,045	'	'	'
Tax benefit from stock compensation plans	243	'	243	'	'
Stock-based compensation expense	1,461	'	1,461	'	'
Balance at Dec. 31, 2011	240,267	94	109,348	133,137	-2,312
Balance, Shares at Dec. 31, 2011	'	9,353,201	'	'	'
Net income (loss)	16,244	'	'	16,244	'
Other comprehensive (loss) income:	'	'	'	'	'
Foreign currency cash flow hedge, net of tax expense	-99	'	'	'	-99
Pension liability adjustment, net of tax benefit	138	'	'	'	138
Issuance of common stock under stock compensation plans	-175	'	-175	'	'
Issuance of common stock under stock compensation plans, shares	'	29,793	'	'	'
Tax benefit from stock compensation plans	9	'	9	'	'
Stock-based compensation expense	3,048	'	3,048	'	'
Balance at Dec. 31, 2012	259,432	94	112,230	149,381	-2,273
Balance, Shares at Dec. 31, 2012	'	9,382,994	'	'	'
Net income (loss)	-923	'	'	-923	'
Other comprehensive (loss) income:	'	'	'	'	'
Foreign currency cash flow hedge, net of tax expense	99	'	'	'	99
Pension liability adjustment, net of tax benefit	913	'	'	'	913
Issuance of common stock under stock compensation plans	-730	'	-730	'	'
Issuance of common stock under stock compensation plans, shares	'	66,305	'	'	'
Tax deficiency from stock compensation plans	-1	'	-1	'	'
Stock-based compensation expense	3,060	'	3,060	'	'
Balance at Dec. 31, 2013	$261,850	$94	$114,559	$148,458	($1,261)
Balance, Shares at Dec. 31, 2013	'	9,449,299	'	'	'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Stockholders Equity [Abstract]	'	'	'
Foreign currency cash flow hedge, tax expense (benefit)	$59	$94	$130
Pension liability adjustment, tax expense (benefit)	$540	$50	$409

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from operating activities:	'	'	'
Net income (loss)	($923)	$16,244	$12,660
Adjustments to reconcile net income (loss) to net cash provided by operating activities:	'	'	'
Depreciation and amortization of property and equipment	13,299	16,267	14,471
Impairment of fixed assets	27,500	'	'
Amortization of intangible assets	'	'	50
Allowance on notes receivable	'	'	4,071
Provision for doubtful accounts	-1,063	98	-501
Equity in earnings of unconsolidated subsidiary	'	'	394
Amortization of debt issuance costs	634	1,318	2,042
Loss on impairment	250	'	'
Deferred income taxes	-7,994	-4,120	5,908
Loss on disposal of property and equipment	256	998	397
Gain on sale of business	'	'	-2,887
Stock-based compensation expense	3,060	3,048	1,461
Tax (deficiency) benefit from stock compensation plans	-1	9	243
Unrealized loss (gain) on foreign currency forward contracts	-195	207	-327
Changes in operating assets and liabilities, net of acquired assets and assumed liabilities	'	'	'
Trade and other receivables	-24,212	28,298	-5,713
Costs and estimated earnings in excess of billings on uncompleted contracts, net	19,736	-36,621	510
Inventories	8,261	-5,582	-29,794
Refundable income taxes	-1,073	'	15,099
Prepaid expenses and other	307	5,480	-5,297
Accounts payable	1,374	-310	-8,920
Deferred revenue	-3,901	7,764	1,029
Accrued and other liabilities	-15,226	11,392	7,379
Net cash provided by operating activities	20,089	44,490	12,275
Cash flows from investing activities:	'	'	'
Acquisition of businesses, net of cash acquired	-15,689	'	'
Additions to property and equipment	-28,447	-16,789	-16,333
Proceeds from sale of business	'	'	13,727
Proceeds from sale of property and equipment	1,711	1,072	96
Issuance of notes receivable	-5,700	-1,000	'
Restricted cash	'	-2,640	2,640
Other investing activities	-126	60	800
Net cash (used in) provided by investing activities	-48,251	-19,297	930
Cash flows from financing activities:	'	'	'
Proceeds from sale of common stock	72	37	147
Tax withholdings related to net share settlements of restricted share awards and performance shares	-802	-212	-80
Payments on long-term debt	-5,714	-5,714	-5,714
Borrowings under note payable to financial institutions	220,721	119,000	132,050
Payments on note payable to financial institutions	-180,334	-133,468	-138,050
Payments of debt issuance costs	'	-1,599	'
Borrowings from capital lease obligations	'	'	1,829
Payments on capital lease obligations	-5,239	-3,373	-3,256
Net cash provided by (used in) financing activities	28,704	-25,329	-13,074
Change in cash and cash equivalents	542	-136	131
Cash and cash equivalents, beginning of period	46	182	51
Cash and cash equivalents, end of period	588	46	182
Supplemental disclosure of cash flow information:	'	'	'
Cash paid during the period for interest, net of amounts capitalized	3,277	4,353	7,220
Cash paid (refunded) during the period for income taxes (net of (refunds) payments of ($311), ($1,834), and $2,292)	9,592	5,007	-12,960
Non-cash investing and financing activities:	'	'	'
Escrow account related to capital lease financing	'	898	897
Accrued property and equipment purchases	1,656	2,777	1,673
Capital lease additions	'	$142	'

Consolidated_Statements_of_Cas1

Consolidated Statements of Cash Flows (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Cash Flows [Abstract]	'	'	'
Tax payments	'	'	$2,292
Tax refunds	($311)	($1,834)	'

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:
	The Company operates in two business segments, Water Transmission and Tubular Products. On December 30, 2013 the Company acquired Permalok Corporation (“Permalok”) which is included in the Water Transmission business segment. The Company has Water Transmission manufacturing facilities in Portland, Oregon; Denver, Colorado; Adelanto, California; Parkersburg, West Virginia; Saginaw, Texas and Monterrey, Mexico. With the acquisition of Permalok, the Company added manufacturing facilities in St. Louis, Missouri, and Salt Lake City, Utah. Tubular Products manufacturing facilities are located in Atchison, Kansas; Houston, Texas; and Bossier City, Louisiana.
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various assumptions that are believed to be reasonable under the circumstances at that time. On an on-going basis, the Company evaluates all of its estimates, including those related to revenue recognition, allowance for doubtful accounts, goodwill, long-lived assets, including depreciation and amortization, inventories, income taxes, and litigation and other contingencies. Actual results could differ from those estimates under different assumptions or conditions.
	Basis of Consolidation and Presentation
	The consolidated financial statements include the accounts of Northwest Pipe Company and its subsidiaries over which the Company exercises control as of the financial statement date. Intercompany accounts and transactions have been eliminated.
	Lucid Energy Inc. (“Lucid Energy”), over which the Company exercises significant influence but does not control, is accounted for under the cost method of accounting. Lucid Energy is a clean energy company based in Portland, Oregon. The carrying value of our investment is $0 at December 31, 2013 and 2012 due to a history of net losses by Lucid Energy.
	Business Combinations and Acquisitions
	The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Contingent consideration is calculated and recorded at the date of the acquisition. During the measurement period, which does not exceed one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed as a result of information received regarding the valuation of assets and liabilities after the acquisition date, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings.
	On December 30, 2013 the Company acquired 100% of the outstanding shares of capital stock of Permalok Corporation, a fabricator of steel piping utilizing the Permalok interlocking pipe joining system. Permalok’s rolled and welded steel pipe products provide an alternate joint solution which complements and expands the Company’s product offerings in the Water Transmission segment. Total consideration (net of cash received) of $15.7 million was paid to the owners of the business, resulting in the recording of $5.3 million of goodwill, none of which is expected to be deductible for tax purposes. The goodwill recorded is attributed to synergies expected from integrating operations of Permalok with the rest of the Company’s Water Transmission business. The goodwill is included within the Water Transmission Group for purposes of segment reporting. Contingent consideration of $4.4 million was recorded in other long-term liabilities as of December 31, 2013, which represents the probability weighted contingent payment as a percentage of high, mid, and low revenue projections for the following three fiscal years. Contingent consideration at the acquisition date was estimated to be between $0.3 million and $5.2 million.
	Pro forma results of operations related to our acquisitions during the year ended December 31, 2013 have not been presented because they are not material to our Consolidated Statements of Operations, either individually or in the aggregate.
	On June 1, 2011, the Company sold all assets of the traffic systems product line of the Tubular Products facility in Houston, Texas. Assets sold as part of this sale included the (i) raw materials, work-in-process, finished goods and related fuel and supplies inventories, (ii) tangible personal property located at the Houston facilities or used by the Company in connection with the traffic business, including machinery, equipment, tooling, operating and maintenance manuals, parts and all other tangible assets used in or related to the traffic business, (iii) receivables, and (iv) other assets. Total consideration of $13.7 million was received, resulting in a gain of $2.9 million recognized in other expense during the second quarter of 2011. The calculation of the gain on sale included a write-off of $973,000 of goodwill.
	Cash and Cash Equivalents
	Cash and cash equivalents consist of cash and short term highly liquid investments with remaining maturities of three months or less when purchased. At times, the Company will have outstanding checks in excess of related bank balances (a book overdraft). If this occurs, the amount of the book overdraft will be reclassified to Accounts Payable, and changes in the book overdraft will be reflected as a component of operating activities in the Consolidated Statements of Cash Flows. The Company did not have a book overdraft at December 31, 2013 or 2012.
	Receivables and Allowance for Doubtful Accounts
	Trade receivables are reported on the balance sheet net of any doubtful accounts. The Company maintains allowances for estimated losses resulting from the inability of its customers to make required payments or from contract disputes. The amounts of such allowances are based on Company history and management’s judgment. At least monthly, the Company reviews past due balances to identify the reasons for non-payment. The Company will write off a receivable account once the account is deemed uncollectible. The Company believes the reported allowances at December 31, 2013 and 2012 are adequate. If the customers’ financial conditions were to deteriorate resulting in their inability to make payments, or if contract disputes were to escalate, additional allowances may need to be recorded which would result in additional expenses being recorded for the period in which such determination was made.
	Customer Prepayments
	Contractual terms may require prepayment of a portion of a contract value in advance of completing the work. Advanced deposits are recorded in accrued liabilities and are offset by invoices as work is performed on the contract. There were no advanced deposits at December 31, 2013. Advanced deposits totaled $9.4 million at December 31, 2012.
	Inventories
	Inventories are stated at the lower of cost or market. Raw material inventories of steel are stated at cost, either on a specific identification basis or on an average cost basis. All other raw material inventories, as well as supplies, are stated on an average cost basis. Finished goods are stated at cost using the first-in, first-out method of accounting.
	Property and Equipment
	Property and equipment is stated at cost. Maintenance and repairs are expensed as incurred, and costs of new equipment and buildings, as well as costs of expansions or refurbishment of existing equipment and buildings, including interest where applicable, are capitalized. Depreciation and amortization are determined by the units of production method for most equipment and by the straight-line method for the remaining assets based on the estimated useful lives of the related assets. Estimated useful lives by major classes of property and equipment are as follows: Land improvements (15 – 30 years); Buildings (20 – 40 years); Machinery and equipment (3 – 30 years). Depreciation expense calculated under the units of production method may be less than, equal to, or greater than depreciation expense calculated under the straight-line method due to variances in production levels. Upon disposal, costs and related accumulated depreciation of the assets are removed from the accounts and resulting gains or losses are reflected in operating expenses. The Company leases certain equipment under long-term capital leases, which are being amortized on a straight-line basis over the shorter of its useful life or the lease term.
	The Company assesses impairment of property and equipment whenever changes in circumstances indicate that the carrying values of the asset or asset group(s) may not be recoverable. The asset group is the lowest level at which identifiable cash flows are largely independent of the cash flows of other groups of assets or liabilities. The recoverable value of long-lived asset group is determined by estimating future undiscounted cash flows using assumptions about the expected future operating performance of the Company.
	In conjunction with the preparation of the financial statements for the year ended December 31, 2013, the Company determined that an impairment triggering event as defined in ASC 360-10 had occurred for the assets located at its Bossier City, Louisiana facility. See Note 4, “Property and Equipment” for further discussion of the property and equipment impairment recorded during 2013.
	Goodwill and Intangible Assets
	Goodwill represents the excess of purchase price over the assigned fair values of the net assets in connection with an acquisition. Goodwill is reviewed for impairment annually at December 31 or whenever events occur or circumstances change that indicates goodwill may be impaired. Goodwill is tested for impairment at the reporting unit level. A reporting unit is an operating segment or one level below an operating segment (also known as a component). Our reporting units are equivalent to our operating segments as the individual components meet the criteria for aggregation.
	Intangible assets consist primarily of customer relationships, patents, and trade names and trademarks recorded as the result of acquisition activity. Intangible assets are amortized using the straight-line method over estimated useful lives ranging from 3 to 15 years.
	See Note 5, “Goodwill and Intangible Assets” for further discussion of the Company’s Goodwill and Intangible Asset balances.
	Workers Compensation Insurance
	The Company is self-insured, or maintains high deductible policies, for losses and liabilities associated with workers compensation claims. Losses are accrued based upon the Company’s estimates of the aggregate liability for claims incurred using historical experience and certain actuarial assumptions followed in the insurance industry.
	Pension Benefits
	The Company has two defined benefit pension plans that have been frozen since 2001. The Company funds these plans to cover current plan costs plus amortization of the unfunded plan liabilities. To record these obligations, management uses estimates relating to investment returns, mortality, and discount rates. Management reviews all of these assumptions on an annual basis.
	Derivative Instruments
	The Company conducts business in foreign countries, and, from time to time, settles transactions in foreign currencies. The Company has established a program that utilizes foreign currency forward contracts to offset the risk associated with the effects of certain foreign currency exposures, typically arising from sales contracts denominated in Canadian currency. Foreign currency forward contracts are consistent with the Company’s strategy for financial risk management. The Company utilizes cash flow hedge accounting treatment for qualifying foreign currency forward contracts. Instruments that do not qualify for cash flow hedge accounting treatment are remeasured at fair value at each balance sheet date and resulting gains and losses are recognized in net income (loss).
	Foreign Currency Transactions
	Assets and liabilities subject to foreign currency fluctuations are translated into United States dollars at the period-end exchange rate, and revenue and expenses are translated at exchange rates representing an average for the period. Translation adjustments from designated hedges are included in accumulated other comprehensive loss as a separate component of stockholders’ equity. Gains or losses on all other foreign currency transactions are recognized in the statement of operations. The functional currency of the Company’s Mexican operations is the United States dollar.
	Revenue Recognition
	Revenue from construction contracts in the Company’s Water Transmission Group is recognized on the percentage-of-completion method. For a majority of contracts, revenue is measured by the costs incurred to date as a percentage of the estimated total costs of each contract (cost-to-cost method). For a small number of contracts, revenue is measured using units of delivery as progress is best estimated by the number of units delivered under the contract. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation. Selling, general and administrative costs are charged to expense as incurred. The cost of steel is recognized as a project cost when the steel is introduced into the manufacturing process. Estimated total costs of each contract are reviewed on a monthly basis by project management and operations personnel for all active projects. All cost revisions that result in the gross profit as a percent of sales increasing or decreasing by more than two percent are reviewed by senior management personnel.
	The Company begins recognizing revenue on a project when persuasive evidence of an arrangement exists, recoverability is reasonably assured, and project costs are incurred. Costs may be incurred before the Company has persuasive evidence of an arrangement. In those cases, if recoverability from that arrangement is probable, the project costs are deferred and revenue recognition is delayed.
	Changes in job performance, job conditions and estimated profitability, including those arising from contract change orders, contract penalty provisions, foreign currency exchange rate movements, changes in raw materials costs, and final contract settlements may result in revisions to estimates of revenue, costs and income and are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted contracts are made in the period such losses are known.
	Revenue from the Company’s Tubular Products Group is recognized when all four of the following criteria have been satisfied: persuasive evidence of an arrangement exists, the price is fixed or determinable, delivery has occurred, and collectability is reasonably assured. Deferred revenue is recorded when the manufacturing process is complete and customers are invoiced prior to physical delivery of the product.
	Income Taxes
	Income taxes are recorded using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s financial statements or tax returns. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. The determination of the provision for income taxes requires significant judgment, the use of estimates and the interpretation and application of complex tax laws. The provision for income taxes primarily reflects a combination of income earned and taxed in the various United States federal and state and, to a lesser extent, foreign jurisdictions. Jurisdictional tax law changes, increases or decreases in permanent differences between book and tax items, accruals or adjustments of accruals for unrecognized tax benefits or valuation allowances, and the change in the mix of earnings from these taxing jurisdictions all affect the overall effective tax rate.
	The Company records tax reserves for federal, state, local and international exposures relating to periods subject to audit. The development of reserves for these exposures requires judgments about tax issues, potential outcomes and timing, and is a subjective estimate. The Company assesses tax positions and records tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, the largest amount of tax benefit with a greater than 50% likelihood of being realized upon settlement with a tax authority that has full knowledge of all relevant information has been recorded. For those tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements.
	Accumulated Other Comprehensive Loss
	Accumulated other comprehensive loss includes unrealized gains and losses on derivative instruments related to the effective portion of cash flow hedges and changes in the funded status of the defined benefit pension plans, both net of the related income tax effect. For further information, refer to Note 16, “Accumulated Other Comprehensive Loss”.
	Earnings (Loss) per Share
	Earnings (loss) per basic and diluted weighted average common shares outstanding was calculated as follows for the years ended December 31 (in thousands, except per share data):
			2013			2012		2011
	Net income (loss) (in thousands)		$	(923	)	$	16,244	$	12,660
	Basic weighted-average common shares outstanding			9,445			9,377		9,333
	Effect of potentially dilutive common shares (1)			—			68		51
	Diluted weighted-average common shares outstanding			9,445			9,445		9,384
	Earnings (loss) per common share:
	Earnings (loss) per basic common share		$	(0.10	)	$	1.73	$	1.36
	Earnings (loss) per diluted common share			(0.10	)		1.72		1.35
	Antidilutive shares excluded from net earnings per diluted common share calculation			93			92		58
	-1	Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.
	Concentrations of Credit Risk
	Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables, derivative contracts, the escrow account and non-qualified retirement savings plan assets. Trade receivables generally represent a large number of customers, including municipalities, manufacturers, distributors and contractors, dispersed across a wide geographic base. At December 31, 2013, two customers had a balance in excess of 10% of total accounts receivable. At December 31, 2012, no customer had a balance in excess of 10% of total accounts receivable. Derivative contracts are with a financial institution rated A-1 by S&P. The Company’s non-qualified retirement savings plan assets, also included in other assets, are invested in a diversified portfolio of stock and bond mutual funds.
	Share-based Compensation
	The Company recognizes the compensation cost of employee and director services received in exchange for awards of equity instruments based on the grant date estimated fair value of the awards. Share-based compensation cost is recognized over the period during which the employee or director is required to provide service in exchange for the award, and as forfeitures occur, the associated compensation cost recognized to date is reversed. Share-based compensation cost related to awards with a performance-based condition is recognized based on the probable outcome of the performance conditions, which requires judgment.
	The Company estimates the fair value of stock options using the Black-Scholes-Merton option pricing model. The Black-Scholes-Merton option pricing model requires the Company to estimate key assumptions such as expected term, volatility, risk-free interest rates and dividend yield to determine the fair value of stock options, based on both historical information and management judgment regarding market factors and trends. The Company estimates the fair value of Restricted Stock Units (“RSUs”) and Performance Stock Awards (“PSAs”) using the value of the Company’s stock on the date of grant, with the exception of market-based PSAs, for which a Monte Carlo simulation model is used. The Monte Carlo simulation model calculates many potential outcomes for an award and estimates fair value based on the most likely outcome.
See Note 12, “Share-based Compensation Plans” for further discussion of the Company’s share-based compensation.
Recent Accounting and Reporting Developments
Accounting Changes
In December 2011, the FASB issued ASU 2011-11 which requires companies to disclose information regarding offsetting and other arrangements for derivatives and other financial instruments. In January 2013, the FASB issued ASU 2013-01, which limited the scope of the balance sheet offsetting disclosures to derivatives, repurchase agreements, and securities lending transactions to the extent that they are (1) offset in the financial statements or (2) subject to an enforceable master netting arrangement or similar agreement. This guidance is effective for interim and annual periods beginning on or after January 1, 2013. The Company adopted this guidance on January 1, 2013 and has made the required additional disclosures.
In February 2013, the FASB issued ASU 2013-02, which clarified the reclassification requirements of ASU 2011-05 which were previously delayed by the FASB in October 2011. Reclassification adjustments which are not reclassified from other comprehensive income to net income in their entirety may instead be parenthetically cross referenced to the related footnote on the face of the financial statements for additional information. This guidance is effective for interim and annual reporting periods beginning after December 15, 2012. The Company adopted this guidance on January 1, 2013 and has made the required additional disclosures.
In July 2013, the FASB issued ASU 2013-10, which allowed for the use of the Fed Funds Effective Swap rate (or Overnight Index Swap rate) as a benchmark interest rate for hedge accounting purposes and removes the restriction on using different benchmark rates for similar hedges. This guidance is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this guidance did not have an impact on the Company’s consolidated financial position or results of operation.
Recent Accounting Standards
In July 2013, the FASB issued ASU 2013-11, which clarified guidance on the presentation of unrecognized tax benefits. The guidance requires that an unrecognized tax benefit, or portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when such items exist in the same taxing jurisdiction. This guidance is effective for interim and annual periods beginning after December 15, 2013, with early adoption permitted. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date, and retrospective application is permitted. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial position.

Costs_and_Estimated_Earnings_i

Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings	'
	2	COSTS AND ESTIMATED EARNINGS IN EXCESS OF BILLINGS ON UNCOMPLETED CONTRACTS AND BILLINGS IN EXCESS OF COSTS AND ESTIMATED EARNINGS:
	Costs and estimated earnings in excess of billings on uncompleted contracts represents revenue earned under the percentage-of-completion method but not yet billable based on the terms of the contracts. These amounts are billed based on the terms of the contracts, which include achievement of milestones, partial shipments or completion of the contracts. Billings in excess of costs and estimated earnings represents amounts billed based on the terms of the contracts in advance of costs incurred and revenue earned.
			December 31,
			2013			2012
			(in thousands)
	Costs incurred on uncompleted contracts		$	182,709		$	211,801
	Estimated earnings			37,438			32,480
				220,147			244,281
	Less billings to date			(173,047	)		(177,445	)
			$	47,100		$	66,836
	Amounts are presented in the Consolidated Balance Sheets as follows:
	Costs and estimated earnings in excess of billings on uncompleted contracts		$	50,468		$	73,314
	Billings in excess of costs and estimated earnings on uncompleted contracts			(3,368	)		(6,478	)
			$	47,100		$	66,836

Inventories

Inventories	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Inventories	'
	3	INVENTORIES:
	Inventories are stated at the lower of cost or market and consist of the following (in thousands):
			December 31,
			2013		2012
	Short-term inventories:
	Raw materials		$	52,598	$	56,913
	Work-in-process			4,902		10,157
	Finished goods			49,351		43,374
	Supplies			3,541		3,101
				110,392		113,545
	Long-term inventories:
	Finished goods			1,249		1,608
	Total inventories		$	111,641	$	115,153
	Long-term inventories are recorded in other assets.

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Property and Equipment	'
	4	PROPERTY AND EQUIPMENT:
	Property and equipment consists of the following (in thousands):
			December 31,
			2013			2012
	Land and improvements		$	24,240		$	23,651
	Buildings			42,763			39,834
	Machinery and equipment			136,581			155,276
	Equipment under capital lease			14,196			21,452
	Construction in progress			14,115			9,906
				231,895			250,119
	Less accumulated depreciation and amortization			(88,834	)		(97,574	)
	Property and equipment, net		$	143,061		$	152,545
	Depreciation and amortization expense was $13.3 million, $16.3 million, and $14.5 million for the years ended December 31, 2013, 2012, and 2011, respectively. Accumulated amortization associated with property and equipment under capital leases was $4.9 million and $8.6 million at December 31, 2013 and 2012, respectively.
	In conjunction with the preparation of the financial statements for the year ended December 31, 2013, the Company determined that an impairment triggering event had occurred for the assets located at its Bossier City, Louisiana facility due to increased competition in the OCTG market and pricing and volume pressures from imported pipe. Further, the Company had previously announced that it was exploring strategic alternatives for its OCTG business. This facility is included within the Tubular Products Group. The Company performed a recoverability test in which the carrying value of the asset group was compared against the probability weighted undiscounted future cash flows of various future scenarios using Company-specific assumptions. The analysis determined the carrying value of the assets was not recoverable as the undiscounted cash flows were less than the carrying value of the asset group. The Company then compared the carrying value to the fair market value of the asset group. Management determined fair value using third-party appraisals which were based on observed comparable sales transactions or similar assets including asset specific adjustments. This analysis resulted in an impairment charge of $27.5 million which was recorded in operating expenses.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Intangible Assets	'
	5	GOODWILL AND INTANGIBLE ASSETS
	Goodwill represents the excess of purchase price over the assigned fair values of the assets and liabilities assumed in conjunction with an acquisition. Goodwill assigned to the Company’s Water Transmission and Tubular Products groups is as follows (in thousands):
			Water Transmission		Tubular Products		Total
	Goodwill balance, December 31, 2011		$	—	$	20,478	$	20,478
	Goodwill balance, December 31, 2012			—		20,478		20,478
	Additions			5,282		—		5,282
	Goodwill balance, December 31, 2013		$	5,282	$	20,478	$	25,760
	No accumulated impairment charges are included within the Goodwill balance at December 31, 2013 or December 31, 2012.
	Goodwill related to the acquisition of Permalok of $5.3 million was quantitatively determined as part of the purchase price allocation as of December 30, 2013. Due to the limited time between the acquisition date and the annual impairment testing date, no additional procedures were deemed necessary.
	Goodwill related to the Company’s Tubular Products Group of $20.5 million was quantitatively evaluated with consideration of the income and market approaches as applicable. The income approach is based upon projected future after-tax cash flows (less capital expenditures) discounted to present value using factors that consider the timing and risk associated with the future after-tax cash flows. The key assumptions in the discounted cash flow analysis are the long-term growth rate, the discount rate, and the annual free cash flow. The market approach is based upon historical measures using EBITDA. The Company utilizes a weighted average of the income and market approaches, with a heavier weighting on the income approach because of the relatively limited number of comparable entities for which relevant multiples are available. The Company also utilizes a sensitivity analysis to determine the impact of changes in discount rates and cash flow forecasts on the valuation of the Tubular operating segment. The analysis performed concluded that it was more likely than not that the fair value of the Tubular Products Group is greater than its carrying value as of December 31, 2013.
	If the Company’s assumptions about goodwill change as a result of events or circumstances, and management believes the assets may have declined in value, then impairment charges will be recorded, resulting in lower profits. The operations of the Tubular Products Group are cyclical and its sales and profitability may fluctuate from year to year. In the evaluation of the Company’s operating segment, the Company looks at the long-term prospects for the reporting unit and recognizes that current performance may not be the best indicator of future prospects or value, which requires management judgment.
	Intangible assets consist of the following (in thousands):
			Gross Carrying		Accumulated		Intangible		Weighted-Average
			Amount		Amortization		Assets, Net		Amortization Period
									(in years)
	Customer relationships		$	1,378	$	—	$	1,378		10
	Patents			1,162		—		1,162		5
	Trade names and trademarks			1,132		—		1,132		15
	Other (1)			295		—		295		4.5
	Total		$	3,967	$	—	$	3,967		9.6
	-1	Other intangibles consist of favorable lease contracts and non-compete agreements
	The residual value of each class of intangible asset is not material. No amortization expense was recorded in 2013 due to the timing of the acquisition of the intangible assets. The estimated amortization expense for the next five fiscal years is as follows (in thousands):
	2014		$	513
	2015			513
	2016			513
	2017			504
	2018			481
	Thereafter			1,443
			$	3,967

Note_Payable_to_Financial_Inst

Note Payable to Financial Institution	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Note Payable to Financial Institution	'
	6	NOTE PAYABLE TO FINANCIAL INSTITUTION:
	At December 31, 2013, the Company had a $165 million Credit Agreement, under which $87.9 million was outstanding. Borrowings under the Credit Agreement are collateralized by substantially all of our personal property. The Credit Agreement bears interest at rates related to LIBOR plus 1.75% to 2.75%, or the lending institution’s prime rate plus 0.75% to 1.75%. The Company was able to borrow at LIBOR plus 2.0% at December 31, 2013. At December 31, 2013 the Company had $69.8 million available under the Credit Agreement while remaining in compliance with the Company’s financial covenants, net of outstanding letters of credit. The Credit Agreement bears interest at a weighted average rate of 2.69% at December 31, 2013.
	At December 31, 2012, $47.5 million was outstanding under the Credit Agreement. The Company was able to borrow at LIBOR plus 2.0% at December 31, 2012. At December 31, 2012 the Company had $90.8 million available under the Credit Agreement while remaining in compliance with the Company’s financial covenants, net of outstanding letters of credit. The Credit Agreement bears interest at a weighted average rate of 2.31% at December 31, 2012.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	7	LONG-TERM DEBT:
			December 31,
			2013		2012
			(in thousands)
	Series A Term Note, maturing on February 25, 2014, due in annual payments of $2.1 million that began February 25, 2008, plus interest at 10.50% paid quarterly, on February 25, May 25, August 25 and November 25, collateralized by accounts receivable, inventory and certain equipment		$	2,143	$	4,286
	Series B Term Note, maturing on June 21, 2014, due in annual payments of $1.5 million that began June 21, 2008, plus interest at 10.22% paid quarterly, on March 21, June 21, September 21 and December 21, collateralized by accounts receivable, inventory and certain equipment			1,500		3,000
	Series C Term Note, maturing on October 26, 2014, due in annual payments of $1.4 million that began October 26, 2008, plus interest at 9.11% paid quarterly, on January 26, April 26, July 26 and October 26, collateralized by accounts receivable, inventory and certain equipment			1,429		2,857
	Series D Term Note, maturing on January 24, 2015, due in annual payments of $643,000 that began January 24, 2009, plus interest at 9.07% paid quarterly, on January 24, April 24, July 24 and October 24, collateralized by accounts receivable, inventory and certain equipment			1,285		1,928
	Total long-term debt		$	6,357	$	12,071
	Amounts are presented in the Consolidated Balance Sheets as follows:
	Current portion of long-term debt		$	5,714	$	5,714
	Long-term debt, less current portion			643		6,357
			$	6,357	$	12,071
	Future principal payments of long-term debt are as follows (in thousands):
	2014		$	5,714
	2015			643
	2016			—
	2017			—
	2018			—
	Thereafter			—
			$	6,357
	Interest expense under the Company’s Credit Agreement and Term Notes was $4.0 million, net of amounts capitalized of $0.4 million in 2013, $5.6 million, net of amounts capitalized of $0.2 million in 2012, and $9.3 million, net of amounts capitalized of $0.2 million in 2011.

Leases

Leases	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Leases	'
	8	LEASES:
	Capital Leases
	The Company leases certain equipment used in the manufacturing process. The future minimum payments under the Company’s capital leases are as follows (in thousands):
	2014		$	2,697
	2015			2,697
	2016			2,145
	2017			1,315
	2018			—
	Thereafter			—
	Total minimum lease payments			8,854
	Amount representing interest			(958	)
	Present value of minimum lease payments with average interest rates of 7.04%			7,895
	Current portion of capital lease obligation			2,216
	Capital lease obligation, less current portion		$	5,679
	We had a total of $7.9 million in capital lease obligations outstanding at December 31, 2013. The weighted average interest rate on all of the Company’s capital leases is 7.04%. The Company’s capital leases are for certain equipment used in the manufacturing process. Of the total capital lease balance, $5.4 million of the Company’s capital leases outstanding as of December 31, 2013 consists of a Financing Arrangement entered into as of September 2009 to finance certain equipment used in the manufacturing process at the Company’s Bossier City, Louisiana facility. As part of the Financing Arrangement, an escrow account was provided for the Company by a local government entity through a financial institution and funds were released for qualifying purchase requisitions. As qualifying equipment was purchased for the facility, the Company entered into a sale-leaseback transaction with the governmental entity as part of the Financing Arrangement. The Financing Arrangement requires the Company to meet certain loan covenants, measured at the end of each fiscal quarter. These loan covenants follow the covenants required by the Company’s Credit Agreement.
	Operating Leases
	The Company has entered into various equipment and property leases with terms of ten years or less. Total rental expense for 2013, 2012, and 2011 was $3.1 million, $3.2 million, and $3.3 million, respectively. Certain of the Company’s operating lease agreements include renewals and/or purchase options set to expire at various dates. Future minimum payments as of December 31, 2013 for operating leases with initial or remaining terms in excess of one year are (in thousands):
	2014		$	2,733
	2015			2,501
	2016			2,225
	2017			1,846
	2018			688
	Thereafter			753
			$	10,746

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	9	FAIR VALUE MEASUREMENTS:
	Assets/Liabilities Measured and Recorded at Fair Value on a Recurring Basis
	The Company records its financial assets and liabilities at fair value, which is defined as the price that would be received to sell an asset or paid to transfer a liability, in the principal or most advantageous market for the asset or liability, in an orderly transaction between market participants at the measurement date. The guidance for fair value measurements also applies to nonrecurring fair value measurements of nonfinancial assets and nonfinancial liabilities.
	The authoritative guidance establishes a fair value hierarchy which prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. These levels are: Level 1 (inputs are quoted prices in active markets for identical assets or liabilities); Level 2 (inputs are other than quoted prices that are observable, either directly or indirectly through corroboration with observable market data); and Level 3 (inputs are unobservable, with little or no market data that exists, such as internal financial forecasts). The Company is required to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value.
	The following table summarizes information regarding the Company’s financial assets and financial liabilities that are measured at fair value on a recurring basis (in thousands):
			Balance at			Level 1		Level 2			Level 3
			December 31,
			2013
	Description
	Financial Assets
	Non – qualified retirement savings plan assets		$	6,000		$	4,944	$	1,056		$	—
	Derivatives			1			—		1			—
	Total Assets		$	6,001		$	4,944	$	1,057		$	—
	Financial Liabilities
	Contingent consideration		$	(4,425	)	$	—	$	—		$	(4,425	)
	Derivatives			(1	)		—		(1	)		—
	Total Liabilities		$	(4,426	)	$	—	$	(1	)	$	(4,425	)
			Balance at			Level 1		Level 2			Level 3
			December 31,
			2012
	Description
	Financial Assets
	Escrow account		$	898		$	898	$	—		$	—
	Non – qualified retirement savings plan assets			5,280			5,280		—			—
	Total Assets		$	6,178		$	6,178	$	—		$	—
	Financial Liabilities
	Derivatives		$	(353	)	$	—	$	(353	)	$	—
	The deferred compensation plan assets consist of cash and several publicly traded stock and bond mutual funds, valued using quoted market prices in active markets classified as Level 1 within the fair value hierarchy, as well as securities that are not actively traded on major exchanges, valued using the NAV of the underlying investments classified as Level 2 within the fair value hierarchy. The Company’s derivatives consist of foreign currency forward contracts, which are accounted for as cash flow hedges, and are valued using various pricing models or discounted cash flow analyses that incorporate observable market parameters, such as interest rate yield curves and currency rates, classified as Level 2 within the valuation hierarchy. Derivative valuations incorporate credit risk adjustments that are necessary to reflect the probability of default by the counterparty or the Company. The escrow account at December 31, 2012 consisted of a money market mutual fund and was valued using quoted market prices in active markets classified as Level 1 within the fair value hierarchy.
	The contingent consideration liability represents the probability weighted contingent payment as a percentage of high, mid, and low revenue projections for the following three fiscal years. Our fair value estimate of this liability was $4.4 million on the acquisition date of Permalok. The inputs used to measure contingent consideration are classified as Level 3 within the valuation hierarchy. The valuation is not supported by market criteria and reflects the Company’s internal revenue forecasts. The discount rate used in the analysis was 5.3%. Changes in the fair value of the contingent consideration payment will be reflected in earnings during the period which the change in the estimated fair value is calculated.
	The net carrying amounts of cash and cash equivalents, trade and other receivables, accounts payable, accrued liabilities and note payable to financial institution approximate fair value due to the short-term nature of these instruments. The Company is obligated to repay the carrying value of the Company’s long term debt. The fair value of the Company’s debt is calculated using a coupon rate on borrowings with similar maturities, current remaining average life to maturity, borrower credit quality, and current market conditions all of which are classified as Level 2 inputs within the valuation hierarchy. The fair value of the Company’s long-term debt, including the current portion, was $6.3 and the carrying value was $6.4 million at December 31, 2013. The fair value of the Company’s long-term debt, including the current portion, was $11.5 million and the carrying value was $12.1 million at December 31, 2012.
	Financial Assets Measured and Recorded at Fair Value on a Non-Recurring Basis
	The Company measures its financial assets, including loans receivable and non-marketable equity method investments, at fair value on a non-recurring basis when they are determined to be other-than-temporarily impaired. The fair value of these assets is determined using Level 3 unobservable inputs due to the absence of observable market inputs and the valuations requiring management judgment. During 2013, there were $0.3 million of impairment charges recorded on investments. The impairment charges were included in other expense in the Consolidated Statement of Operations. During 2012, there were no impairment charges taken.

Derivative_Financial_Instrumen

Derivative Financial Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Financial Instruments and Hedging Activities	'
	10	DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES:
	The Company conducts business in various foreign countries and, from time to time, settles transactions in foreign currencies. The Company has established a program that utilizes foreign currency forward contracts to offset the risk associated with the effects of certain foreign currency exposures, typically arising from sales contracts denominated in Canadian currency. Instruments that do not qualify for cash flow hedge accounting treatment are re-measured at fair value on each balance sheet date and resulting gains and losses are recognized in net income. As of December 31, 2013 and 2012, the total notional amount of the derivative contracts not designated as hedges was $0.1 million (CAD$0.1 million) and $2.7 million (CAD$2.6 million), respectively. As of December 31, 2013 and 2012, the total notional amount of the derivative contracts designated as hedges was $3.8 million (CAD$4.1 million) and $12.4 million (CAD$12.3 million), respectively. Derivative assets are included within prepaid expenses and other and derivative liabilities are included within accrued liabilities in the Consolidated Balance Sheets. All of the Company’s foreign currency forward contracts are subject to an enforceable master netting arrangement. The Company presents its foreign currency forward contract assets and liabilities within the Consolidated Balance Sheets at their gross fair values.
	For each derivative contract entered into in which the Company seeks to obtain cash flow hedge accounting treatment, the Company formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking the hedge transaction, the nature of the risk being hedged, how the hedging instrument’s effectiveness in offsetting the hedged risk will be assessed prospectively and retrospectively, and a description of the method of measuring ineffectiveness. This process includes linking all derivatives to specific firm commitments or forecasted transactions and designating the derivatives as cash flow hedges. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative contracts that are used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The effective portion of these hedged items is reflected in other comprehensive income on the Consolidated Statement of Stockholders’ Equity. If it is determined that a derivative contract is not highly effective, or that it has ceased to be a highly effective hedge, the Company will be required to discontinue hedge accounting with respect to that derivative contract prospectively.
	All of the Company’s Canadian forward contracts have maturities not longer than 12 months as of December 31, 2013, except one contract with a notional value of $3.8 million (CAD$4.0 million) which has a remaining maturity of 13 months.
	For the years ended December 31, 2013, 2012 and 2011, gains (losses) of ($0.1) million, ($0.4) million and $0.1 million, respectively, from derivative contracts not designated as hedging instruments were recognized in net sales. At December 31, 2013, there is $0.1 million of unrealized pretax gain on outstanding derivatives accumulated in other comprehensive loss, substantially all of which is expected to be reclassified to net sales within the next 12 months as a result of underlying hedged transactions also being recorded in net sales. See Note 16, “Accumulated Other Comprehensive Loss” for additional quantitative information regarding derivative gains and losses.

Retirement_Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Retirement Plans	'
	11	RETIREMENT PLANS:
	The Company has a defined contribution retirement plan that covers substantially all of its employees and provides for a Company match of up to 50% of the first 6% of employee contributions to the plan, subject to certain limitations. The defined contribution retirement plan offers twenty-five investment options.
	The Company has a non-qualified retirement savings plan that covers officers and selected highly compensated employees. The non-qualified plan generally matches up to 50% of the first $10,000 of officer contributions to the plan and the first $5,000 of other selected highly compensated employee contributions, subject to certain limitations. It also provides officers with a Company funded component with a retirement target benefit. The retirement target benefit amount is an actuarially estimated amount necessary to provide 35% of final base pay after a 35-year career with the Company or 1% of final base pay per year of service. The actual benefit, however, assumes an investment growth at 8% per year. Should the investment growth be greater than 8%, the benefit will be more, but if it is less than 8%, the amount will be less and the Company does not make up any deficiency.
	The Company also has two noncontributory defined benefit plans. Effective 2001, both plans were frozen, and participants were fully vested in their accrued benefits as of the date each plan was frozen. No additional participants can be added to the plans and no additional service can be earned by participants subsequent to the date the plans were frozen. The funding policy for each noncontributory defined benefit plan is based on current plan costs plus amortization of the unfunded plan liability. All current employees covered by these plans are now covered by the defined contribution retirement plan. As of December 31, 2013, the Company had recorded an accrued pension liability of $1.2 million and an unrecognized actuarial loss, net of tax, of $1.2 million in accumulated other comprehensive loss. As of December 31, 2012 the Company had recorded, in accordance with the actuarial valuation, an accrued pension liability of $2.6 million and an unrecognized actuarial loss, net of tax, of $2.2 million in accumulated other comprehensive loss. Additionally, as of December 31, 2013 and 2012, the projected and accumulated benefit obligation was $5.8 million and $6.7 million, respectively, and the fair value of plan assets was $4.6 million and $4.1 million, respectively. The net periodic benefit cost was $0.4 million for the year ended December 31, 2013, $0.4 million for the year ended December 31, 2012, and $0.3 million for the year ended December 31, 2011. The weighted average discount rates used to measure the projected benefit obligation were 4.40% and 3.52% as of December 31, 2013 and 2012, respectively. The plan assets are invested in growth mutual funds, consisting of a mix of debt and equity securities, which are categorized as Level 2 under the fair value hierarchy. The expected weighted average long term rate of return on plan assets was 7.5% as of December 31, 2013 and 2012, respectively.
	Total expense for all retirement plans in 2013, 2012 and 2011 was $1.8 million, $1.7 million and $1.3 million, respectively.

ShareBased_Compensation_Plans

Share-Based Compensation Plans	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Share-Based Compensation Plans	'
	12	SHARE-BASED COMPENSATION PLANS:
	The Company has one active stock incentive plan for employees and directors, the 2007 Stock Incentive Plan, which provides for awards of stock options to purchase shares of common stock, stock appreciation rights, restricted and unrestricted shares of common stock, restricted stock units (“RSUs”) and performance share awards (“PSAs”). In addition, the Company has one inactive stock option plan, the 1995 Stock Options Plan for Nonemployee Directors, under which previously granted options remain outstanding. The plans provide that options become exercisable according to vesting schedules, which range from immediate to ratably over a 60-month period. Options terminate 10 years from the date of grant. The plans also provide for other equity instruments, such as RSUs and PSAs, which grant the right to receive a specified number of shares over a specified period of time. RSUs are service-based awards and vest according to vesting schedules, which range from immediate to ratably over a three-year period. PSAs are service-based awards with a market-based vesting condition. Vesting of the market-based PSAs is dependent upon the performance of the market price of the Company’s stock relative to a comparator group of companies and ranges from two to three years. The following summarizes share-based compensation expense recorded:
			Year ended December 31,
			2013			2012		2011
			(in thousands)
	Cost of sales		$	662		$	432	$	143
	Selling, general and administrative expenses			2,398			2,616		1,318
	Total		$	3,060		$	3,048	$	1,461
	As of December 31, 2013, unrecognized compensation expense related to the unvested portion of the Company’s RSUs and PSAs was $3.9 million, which is expected to be recognized over a weighted average period of 1.8 years.
	There were 720,301 shares of common stock available for future issuance under the Company’s stock compensation plans at December 31, 2013; an additional 40,000 options and 257,087 RSUs and PSAs have been granted and remain outstanding. There were 227,177 and 307,984 shares of common stock available for future issuance under the Company’s stock compensation plans at December 31, 2012 and 2011, respectively.
	Stock Options Awards
	A summary of status of the Company’s stock options as of December 31, 2013 and changes during the three years then ended is presented below:
			Options			Weighted		Weighted		Aggregate
						Average		Average		Intrinsic
						Exercise		Remaining		Value
						Price		Contractual
								Life
								(in years)		(in thousands)
	Balance, December 31, 2010			145,209		$	17.64
	Options granted			—			—
	Options exercised or exchanged			(73,612	)		14.12
	Options cancelled			—			—
	Balance, December 31, 2011			71,597			21.26
	Options granted			—			—
	Options exercised or exchanged			(24,597	)		17.58
	Options cancelled			—			—
	Balance, December 31, 2012			47,000			23.19
	Options granted			—			—
	Options exercised or exchanged			(7,000	)		10.31
	Options cancelled			—			—
	Balance, December 31, 2013			40,000			25.44
	Exercisable and Outstanding, December 31, 2013			40,000			25.44		4.65	$	493
	The total intrinsic value, defined as the difference between the current market value and the grant price, of options exercised during the years ended December 31, 2013, 2012 and 2011 was $0.1 million, $0.1 million and $0.8 million, respectively.
	The following table summarizes information about stock options outstanding at December 31, 2013:
	Options Outstanding									Options Exercisable
	Range of Exercise		Number of			Weighted Average		Weighted Average		Number of		Weighted Average
	Prices Per Share		Options			Remaining		Exercise Price Per		Options		Exercise Price Per
						Contractual Life		Share				Share
						(years)
	$14.00			2,000			0.36		14		2,000		14
	$22.07			4,000			1.36		22.07		4,000		22.07
	$24.15			24,000			6.25		24.15		24,000		24.15
	$28.31			4,000			2.36		28.31		4,000		28.31
	$34.77			6,000			3.41		34.77		6,000		34.77
				40,000			4.65		25.44		40,000		25.44
	There were no options granted during 2013, 2012 or 2011.
	Restricted Stock Units and Performance Awards
	A summary of status of the Company’s RSUs and PSAs as of December 31, 2013 and changes during the three years then ended is presented below:
			Number of			Weighted
			RSUs and			Average Grant
			PSAs			Date Fair
						Value
	Unvested RSUs and PSAs at December 31, 2010			55,843		$	37
	RSUs and PSAs granted			174,891			23.32
	Unvested RSUs and PSAs cancelled			(20,997	)		47.46
	RSUs and PSAs vested			(15,756	)		26.27
	Unvested RSUs and PSAs at December 31, 2011			193,981			24.41
	RSUs and PSAs granted			115,306			29.06
	Unvested RSUs and PSAs cancelled			(39,306	)		28.44
	RSUs and PSAs vested			(26,840	)		23.13
	Unvested RSUs and PSAs at December 31, 2012			243,141			26.11
	RSUs and PSAs granted			117,966			34.24
	Unvested RSUs and PSAs cancelled			(16,002	)		27.45
RSUs and PSAs vested			(88,018	)		23.37
Unvested RSUs and PSAs at December 31, 2013			257,087		$	30.69
The unvested balance of RSUs and PSAs at December 31, 2013 includes approximately 196,000 PSAs included at a target level. The vesting of these awards is subject to the achievement of specified market-based conditions, and the actual number of common shares that will ultimately be issued will be determined by multiplying this number of PSAs by a payout percentage ranging from 0% to 200%.
The total fair value of RSUs and PSAs vested during the years ended December 31, 2013, 2012, and 2011 was $2.1 million, $0.6 million, and $0.4 million, respectively.
Stock Awards
For the years ended December 31, 2013, 2012 and 2011, stock awards were granted to non-employee directors, which vested immediately upon issuance, as follows: 4,912 shares; 4,807 shares; and 6,261 shares, respectively. The Company recorded compensation expense based on the fair market value per share of the awards on the grant date of $27.49 in 2013, $23.40 in 2012, and $25.15 in 2011.

Shareholder_Rights_Plan

Shareholder Rights Plan	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Shareholder Rights Plan	'
	13	SHAREHOLDER RIGHTS PLAN:
	In June 1999, the Board of Directors adopted a Shareholder Rights Plan (the “Plan”) designed to ensure fair and equal treatment for all shareholders in the event of a proposed acquisition of the Company by enhancing the ability of the Board of Directors to negotiate more effectively with a prospective acquirer, and reserved 150,000 shares of Series A Junior Participating Preferred Stock (“Preferred Stock”) for purposes of the Plan. In connection with the adoption of the Plan, the Board of Directors declared a dividend distribution of one non-detachable preferred stock purchase right (a “Right”) per share of common stock, payable to shareholders of record on July 9, 2000. Each Right represents the right to purchase one one-hundredth of a share of Preferred Stock at a price of $83.00, subject to adjustment. The Rights will be exercisable only if a person or group acquires, or commences a tender offer to acquire, 15% or more of the Company’s outstanding shares of common stock. Subject to the terms of the Plan and upon the occurrence of certain events, each Right would entitle the holder to purchase common stock of the Company, or of an acquiring company in certain circumstances, having a market value equal to two times the exercise price of the Right. The Company may redeem the Rights at a price of $0.01 per Right under certain circumstances.
	On June 18, 2009, the Company and Computershare (“Rights Agent”) entered into an Amended and Restated Rights Agreement (the “Amended and Restated Rights Agreement”). The Amended and Restated Rights Agreement amended and restated the Rights Agreement dated as of June 28, 1999 between the Company and ChaseMellon Shareholder Services, L.L.C. (predecessor to the Rights Agent). The Amended and Restated Rights Agreement extended the Final Expiration Date of the Rights from June 28, 2009 to June 28, 2019. The Amended and Restated Rights Agreement also reflected certain changes in the rights and obligations of the Rights Agent and certain changes in procedural requirements under the Amended and Restated Rights Agreement.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	14	COMMITMENTS AND CONTINGENCIES:
	Portland Harbor Superfund
	On December 1, 2000, a section of the lower Willamette River known as the Portland Harbor was included on the National Priorities List at the request of the United States Environmental Protection Agency (the “EPA”). While the Company’s Portland, Oregon manufacturing facility does not border the Willamette River, an outfall from the facility’s stormwater system drains into a neighboring property’s privately owned stormwater system and slip. Since the listing of the site, the Company was notified by the EPA and the Oregon Department of Environmental Quality (the “ODEQ”) of potential liability under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”). In 2008, the Company was asked to file information disclosure reports with the EPA (CERCLA 104 (e) information request). By agreement with the EPA, the ODEQ is responsible for overseeing remedial investigation and source control activities for all upland sites to investigate sources and prevent future contamination to the river. A remedial investigation and feasibility study (“RI/FS”) of the Portland Harbor has been directed by a group of 14 potentially responsible parties known as the Lower Willamette Group (the “LWG”) under agreement with the EPA. The Company made a payment of $175,000 to the LWG in June 2007 as part of an interim settlement, and is under no obligation to make any further payment. The final draft remedial investigation (“RI”) was submitted to the EPA by the LWG in fall of 2011 and the draft feasibility study (“FS”) was submitted by the LWG to the EPA in March 2012. The draft FS identifies ten possible remedial alternatives which range in estimated cost from approximately $169 million to $1.76 billion and estimates a range of two to 28 years to implement the remedial work, depending on the selected alternative. The report does not determine who is responsible for the costs of cleanup or how the cleanup costs will be allocated among the potentially responsible parties. As of the date of this filing, the final RI and the revised FS are scheduled to be submitted to the EPA in the second quarter of 2014.
	In 2001, groundwater containing elevated volatile organic compounds (“VOCs”) was identified in one localized area of leased property adjacent to the Portland facility furthest from the river. Assessment work in 2002 and 2003 to further characterize the groundwater was consistent with the initial conclusion that the source of the VOCs is located off of Company-owned property. In February 2005, the Company entered into a Voluntary Agreement for Remedial Investigation and Source Control Measures (the “Agreement”) with the ODEQ. The Company is one of many Upland Source Control Sites working with the ODEQ on Source Control and is considered a “medium” priority site by the ODEQ. The Company performed RI work required under the Agreement and submitted a draft RI/Source Control Evaluation Report in December 2005. The conclusions of the report indicated that the VOCs found in the groundwater do not present an unacceptable risk to human or ecological receptors in the Willamette River. The report also indicated there is no evidence at this time showing a connection between detected VOCs in groundwater and Willamette River sediments. In 2009, the ODEQ requested that the Company revise its RI/Source Control Evaluation Report from 2005 to include more recent information from focused supplemental sampling at the Portland facility and more recent information that has become available related to nearby properties. The Company submitted the Expanded Risk Assessment for the VOCs in Groundwater in May 2012. In February 2013, the ODEQ requested the Company revise the presented information in the 2012 Expanded Risk Assessment for the VOCs in Groundwater a second time. The presented information was revised by the Company and submitted with the Final RI/Source Control Evaluation report in January 2014.
	Also, based on sampling associated with the Portland facility’s RI and on sampling and reporting required under the Portland, Oregon manufacturing facility’s National Pollutant Discharge Elimination System permit for storm water, the Company and the ODEQ have periodically detected low concentrations of polynuclear aromatic hydrocarbons (“PAHs”), polychlorinated biphenyls (“PCBs”), and trace amounts of zinc in storm water. Storm water from the Portland, Oregon manufacturing facility site is discharged into a communal storm water system that ultimately discharges into the neighboring property’s privately owned slip. The slip was historically used for shipbuilding and subsequently for ship breaking and metal recycling. Studies of the river sediments have revealed trace concentrations of PAHs, PCBs and zinc, along with other constituents which are common constituents in urban storm water discharges. To minimize the pollutants in its storm water, the Company painted a substantial part of the Portland facility’s roofs in 2009 and installed a storm water treatment system in 2012. Stormwater discharge has remained below storm water benchmark levels ever since.
	Under the ODEQ Agreement, the Company submitted a Final Supplemental Work Plan to evaluate and assess soil and storm water, and further assess groundwater risk, as requested by the ODEQ. The Company submitted a remediation plan related to soil contamination, which the ODEQ approved. The Company has completed the approved remediation plan in 2011 and 2012, which included the excavation of localized soil and paving pervious surfaces. A final report on storm water source control with the Final RI/Source Control Evaluation report was submitted in January 2014.
	During the localized soil excavation in 2011, additional stained soil was discovered. At the request of the ODEQ, the Company developed an additional Work Plan to characterize the nature and extent of soil and/or groundwater impacts from the staining. The Company began implementing this Work Plan in the second quarter of 2012 and submitted sampling results to the ODEQ in the third quarter of 2012. Comments from the ODEQ were received in November 2012. In February 2013, the ODEQ clarified its comments from November 2012, and the Company has completed its second round of groundwater sampling for the Stained Soil Investigation Area. The results were reported to ODEQ in January 2014.
	The Company spent less than $0.1 million for Source Control work in 2013 and anticipates having to spend less than $0.1 million for further Source Control work in 2014.
	Concurrent with the activities of the EPA and the ODEQ, the Portland Harbor Natural Resources Trustee Council (“Trustees”) sent some or all of the same parties, including the Company, a notice of intent to perform a Natural Resource Damage Assessment (“NRDA”) for the Portland Harbor Site to determine the nature and extent of natural resource damages under CERCLA section 107. The Trustees for the Portland Harbor Site consist of representatives from several Northwest Indian Tribes, three federal agencies and one state agency. The Trustees act independently of the EPA and the ODEQ. The Trustees have encouraged potentially responsible parties to voluntarily participate in the funding of their injury assessments and several of those parties have agreed to do so. In 2009, one of the Tribal Trustees (the Yakima Nation) resigned and has requested funding from the same parties to support its own assessment. The Company has not assumed any payment obligation or liability related to either request.
	The Company’s potential liability is a portion of the costs of the remedy the EPA will select for the entire Portland Harbor Superfund site. The cost of that remedy is expected to be allocated among more than 100 potentially responsible parties. Because of the large number of responsible parties and the variability in the range of remediation alternatives, the Company is unable to estimate an amount or an amount within a range of costs for its obligation with respect to the Portland Harbor matters, and no further adjustment to the Consolidated Financial Statements has been recorded as of December 31, 2013. The Company has insurance policies for defense costs, as well indemnification policies it believes will provide reimbursement for any share of the remediation assessed. However, the Company can provide no assurance that those policies will cover all of the costs which the Company may incur.
	All Sites
	The Company operates its facilities under numerous governmental permits and licenses relating to air emissions, storm water run-off, and other environmental matters. The Company’s operations are also governed by many other laws and regulations, including those relating to workplace safety and worker health, principally the Occupational Safety and Health Act and regulations there under which, among other requirements, establish noise and dust standards. The Company believes it is in material compliance with its permits and licenses and these laws and regulations, and the Company does not believe that future compliance with such laws and regulations will have a material adverse effect on its financial position, results of operations or cash flows.
	From time to time, the Company is involved in litigation relating to claims arising out of its operations in the normal course of its business. The Company maintains insurance coverage against potential claims in amounts that are believed to be adequate. The Company believes that it is not presently a party to any other litigation, the outcome of which would have a material adverse effect on its business, financial condition, results of operations or cash flows.
	Guarantees
	The Company has entered into certain stand-by letters of credit that total $3.1 million at December 31, 2013. The stand-by letters of credit relate to workers’ compensation insurance and equipment financing.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	15	INCOME TAXES:
	The components of the provision for (benefit from) income taxes are as follows:
			Year Ended December 31,
			2013			2012			2011
			(in thousands)
	Current:
	Federal		$	5,737		$	5,428		$	2,639
	State			566			130			695
	Total current tax expense			6,303			5,558			3,334
	Deferred:
	Federal			(7,319	)		(296	)		5,380
	State			(1,110	)		259			904
	Total deferred tax expense			(8,429	)		(37	)		6,284
			$	(2,126	)	$	5,521		$	9,618
	The difference between the Company’s effective income tax rates and the statutory United States federal income tax rate of 35% is explained as follows:
			Year Ended December 31,
			2013			2012			2011
			(in thousands)
	Provision (benefit) at statutory rate of 35%		$	(1,067	)	$	7,618		$	7,800
	State provision, net of federal benefit			(393	)		519			922
	Research and development credits			(916	)		(1,734	)		—
	Domestic manufacturing deduction			(641	)		(762	)		(389	)
	Sale of business			—			—			341
	Change in valuation allowance			954			—			872
	Uncertain tax positions			(311	)		(67	)		126
	Nondeductible expenses			370			278			190
	Other			(122	)		(331	)		(244	)
			$	(2,126	)	$	5,521		$	9,618
	Effective tax (benefit) rate			(69.7	)%		25.4	%		43.2	%
	The tax effect of temporary differences that give rise to significant portions of deferred tax assets and liabilities is presented below:
			December 31,
			2013			2012
			(in thousands)
	Current deferred tax assets:
	Costs and estimated earnings in excess of billings on uncompleted contracts, net		$	2,384		$	1,323
	Accrued employee benefits			951			1,612
	Inventories			2,671			1,393
	Trade receivable, net			319			650
	Net operating loss carryforwards			500			364
	Other			520			693
				7,345			6,035
	Valuation allowance			(500	)		(146	)
				6,845			5,889
	Current deferred tax liabilities:
	Prepaid expenses			(637	)		(712	)
	Current deferred tax assets, net			6,208			5,177
	Noncurrent deferred tax assets:
	Net operating loss carryforwards			211			549
	Tax credit carryforwards			478			64
	Accrued employee benefits			3,740			3,673
	Other assets			5,520			4,527
	Other			138			17
				10,087			8,830
	Valuation allowance			(1,394	)		(794	)
				8,693			8,036
	Noncurrent deferred tax liabilities:
	Property and equipment			(19,343	)		(23,290	)
	Intangible assets			(1,192	)		—
	Noncurrent deferred tax liabilities, net			(11,842	)		(15,254	)
	Net deferred tax liabilities		$	(5,634	)	$	(10,077	)
	As of December 31, 2013, the Company had approximately $13 million of state net operating loss carryforwards which expire on various dates between 2018 and 2031. The Company also had state tax carryforwards of $889,000, which begin to expire in 2014.
	The Company considers the earnings of the Mexican subsidiary to be indefinitely reinvested outside the United States on the basis of estimates that future domestic cash generation will be sufficient to meet future domestic cash needs. Should the Company decide to repatriate the foreign earnings, the income tax provision would be adjusted in the period it is determined that the earnings will no longer be indefinitely reinvested outside the United States, and a deferred tax liability of approximately $650,000 related to the United States federal and state income taxes and foreign withholding taxes on approximately $1.9 million of undistributed foreign earnings would be recorded.
	The Company files income tax returns in the United States Federal jurisdiction, in a limited number of foreign jurisdictions, and in many state jurisdictions. The Company is currently under examination by the Internal Revenue Service for years 2009, 2010 and 2011. With few exceptions, the Company is no longer subject to United States Federal or state income tax examinations for years before 2009.
A summary of the changes in the unrecognized tax benefits during the years ended December 31, 2013, 2012 and 2011 is presented below (in thousands):
		2013			2012			2011
Unrecognized tax benefits, beginning of year		$	5,245		$	309		$	125
Increases for positions taken in prior years			646			3,571			10
Decreases for positions taken in prior years			(696	)		(184	)		—
Increases for positions taken in the current year			1,012			1,549			174
Unrecognized tax benefits, end of year		$	6,207		$	5,245		$	309
The Company believes it is reasonably possible that the total amounts of unrecognized tax benefits will decrease in the following twelve months due to the anticipated settlement of the examination by the Internal Revenue Service; however, actual results could differ from those currently expected. Of the balance of unrecognized tax benefits, $2.1 million would affect the Company’s effective tax rate if recognized at some point in the future.
The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2013 and 2012, the Company has approximately $268,000 and $172,000, respectively, of accrued interest related to uncertain tax positions. Total interest for uncertain tax positions increased by approximately $96,000 in 2013, $100,000 in 2012, and $8,000 in 2011.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Accumulated Other Comprehensive Loss	'
	16	ACCUMULATED OTHER COMPREHENSIVE LOSS
	Accumulated other comprehensive loss consists of the following (in thousands):
			December 31,
			2013			2012
	Pension liability adjustment, net of tax benefit of $704 and $1,244		$	(1,275	)	$	(2,188	)
	Deferred gain (loss) on cash flow derivatives, net of tax expense of $9 and benefit of $50			14			(85	)
	Total		$	(1,261	)	$	(2,273	)
	The following table summarizes changes in the components of accumulated other comprehensive income (loss) during the twelve months ended December 31, 2013 and December 31, 2012 (in thousands). All amounts are net of tax:
			Defined Benefit			Gains (Losses) on			Total
			Pension Items			Cash Flow
						Hedges
	Balance, December 31, 2011		$	(2,326	)	$	14		$	(2,312	)
	Other comprehensive loss before reclassifications			(175	)		(120	)		(295	)
	Amounts reclassified from accumulated other comprehensive income (loss)			313			21			334
	Net current period other comprehensive income (loss)			138			(99	)		39
	Balance, December 31, 2012		$	(2,188	)	$	(85	)	$	(2,273	)
	Other comprehensive income before reclassifications			674			171			803
	Amounts reclassified from accumulated other comprehensive income (loss)			239			(72	)		209
	Net current period other comprehensive income			913			99			1,012
	Balance, December 31, 2013		$	(1,275	)	$	14		$	(1,261	)
	The following table provides additional detail about accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statements of Operations during the twelve months ended December 21, 2013, 2012 and 2011 (in thousands):
	Details about Accumulated Other		Amount reclassified from Accumulated Other									Affected line item in the
	Comprehensive Income (Loss) Components		Comprehensive Income (Loss)									Consolidated
												Statements of Operations
			2013			2012			2011
	Defined Benefit Pension Items
	Net periodic pension cost		$	(372	)	$	(417	)	$	(266	)	Cost of sales
				133			104			90		Tax benefit
			$	(239	)	$	(313	)	$	(176	)	Net of tax
	Gains and (losses) on cash flow hedges
	Foreign currency forward contracts		$	114		$	(40	)	$	(501	)	Net sales
				(42	)		19			183		Tax (expense) benefit
			$	72		$	(21	)	$	(318	)	Net of tax
	Total reclassifications for the period		$	(209	)	$	(334	)	$	(494	)

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	17	SEGMENT INFORMATION:
	The operating segments reported below are based on the nature of the products sold by the Company and are the segments of the Company for which separate financial information is available and for which operating results are regularly evaluated by executive management to make decisions about resources to be allocated to the segment and assess its performance. Management evaluates segment performance based on operating income.
	The Company’s Water Transmission segment manufactures and markets large diameter, high-pressure steel pipe used primarily for water transmission. The Company’s Water Transmission products are manufactured at one of eight manufacturing facilities located in Portland, Oregon; Denver, Colorado; Adelanto, California; Parkersburg, West Virginia; Saginaw, Texas; and Monterrey, Mexico. Facilities in St. Louis, Missouri and Salt Lake City, Utah were added in 2013 upon the acquisition of Permalok on December 30, 2013. During the second half of 2012, we permanently closed our facility located in Pleasant Grove, Utah, and have transferred its property and equipment to other manufacturing locations. Products are sold primarily to public water agencies either directly or through an installation contractor.
	The Company’s Tubular Products segment manufactures and markets smaller diameter, ERW steel pipe for use in a wide range of applications, including energy, construction, agricultural, and industrial systems. Tubular Products manufacturing facilities are located in Atchison, Kansas; Houston, Texas; and Bossier City, Louisiana. Tubular Products are marketed through a network of direct sales force personnel and sales agents throughout the United States, Canada and Mexico.
	Based on the location of the customer, the Company sold principally all products in the United States, Canada and Mexico. One customer accounted for 12% of total net sales in 2013. One customer accounted for 12% of total net sales in 2012. No one customer represented more than 10% of total net sales in 2011. As of December 31, 2013, all material long-lived assets are located in the United States.
			Year Ended December 31,
			2013			2012			2011
			(in thousands)
	Net sales:
	Water transmission		$	226,427		$	269,203		$	271,885
	Tubular products			249,129			255,300			239,783
	Total		$	475,556		$	524,503		$	511,668
	Gross profit:
	Water transmission		$	46,953		$	45,051		$	43,182
	Tubular products			5,506			11,147			15,956
	Total		$	52,459		$	56,198		$	59,138
	Operating income (loss):
	Water transmission		$	40,343		$	36,278		$	34,113
	Tubular products			(24,843	)		8,335			12,660
				15,500			44,613			46,773
	Corporate			(14,751	)		(17,053	)		(13,950	)
	Total		$	749		$	27,560		$	32,823
	Depreciation and amortization expense:
	Water transmission		$	7,082		$	10,474		$	8,729
	Tubular products			5,963			5,541			5,723
				13,045			16,015			14,452
	Corporate			254			252			69
	Total		$	13,299		$	16,267		$	14,521
	Capital expenditures:
	Water transmission		$	13,204		$	6,830		$	4,765
	Tubular products			14,354			9,813			11,386
				27,558			16,643			16,151
	Corporate			889			146			182
	Total		$	28,447		$	16,789		$	16,333
	Net sales by geographic region:
	United States		$	441,779		$	473,403		$	455,625
	Other			33,777			51,100			56,043
	Total		$	475,556		$	524,503		$	511,668
			December 31,
			2013			2012
			(in thousands)
	Goodwill:
	Water transmission		$	5,282		$	—
	Tubular products			20,478			20,478
	Total		$	25,760		$	20,478
	Total assets:
	Water transmission		$	218,849		$	221,987
	Tubular products			184,088			174,591
				402,937			396,578
	Corporate			30,522			25,844
	Total		$	433,459		$	422,422
	All property and equipment is located in the United States as of December 31, 2013 and 2012, except for a total of $2.2 million and $2.4 million, respectively, which is located in Mexico.

Quarterly_Data

Quarterly Data	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Quarterly Data	'
	18	QUARTERLY DATA (UNAUDITED):
	Summarized quarterly financial data for 2013 and 2012 is as follows (dollars in thousands, except per share).
			First			Second			Third			Fourth			Total
			Quarter			Quarter			Quarter			Quarter
	For the year ended December 31, 2013
	Net sales:
	Water transmission		$	78,613		$	58,148		$	46,835		$	42,831		$	226,427
	Tubular products			61,984			58,590			56,187			72,368			249,129
	Total		$	140,597		$	116,738		$	103,022		$	115,199		$	475,556
	Gross profit (loss):
	Water transmission		$	19,870		$	12,125		$	7,932		$	7,026		$	46,953
	Tubular products			1,334			3,543			880			(251	)		5,506
	Total		$	21,204		$	15,668		$	8,812		$	6,775		$	52,459
	Operating income (loss):
	Water transmission		$	18,033		$	10,499		$	6,306		$	5,505		$	40,343
	Tubular products			666			2,885			93			(28,487	)		(24,843	)
	Corporate			(3,879	)		(4,004	)		(3,559	)		(3,309	)		(14,751	)
	Total		$	14,820		$	9,380		$	2,840		$	(26,291	)	$	749
	Net income (loss)		$	9,506		$	5,561		$	1,016		$	(17,006	)	$	(923	)
	Earnings (loss) per share:
	Basic		$	1.01		$	0.59		$	0.11		$	(1.80	)	$	(0.10	)
	Diluted		$	1		$	0.59		$	0.11		$	(1.80	)	$	(0.10	)
	The fourth quarter of 2013 includes a fixed asset impairment charge of $27.5 million recorded to the Tubular Products Group which is reflected in Operating income (loss).
			First			Second			Third			Fourth			Total
			Quarter			Quarter			Quarter			Quarter
	For the year ended December 31, 2012
	Net sales:
	Water transmission		$	58,431		$	59,050		$	63,487		$	88,235		$	269,203
	Tubular products			83,744			71,991			51,612			47,953			255,300
	Total		$	142,175		$	131,041		$	115,099		$	136,188		$	524,503
	Gross profit:
	Water transmission		$	9,699		$	8,149		$	9,681		$	17,522		$	45,051
	Tubular products			6,801			5,428			1,919			(3,001	)		11,147
	Total		$	16,500		$	13,577		$	11,600		$	14,521		$	56,198
	Operating income (loss):
	Water transmission		$	8,024		$	6,130		$	6,969		$	15,155		$	36,278
	Tubular products			6,196			4,651			1,134			(3,646	)		8,335
	Corporate			(5,041	)		(3,811	)		(4,074	)		(4,127	)		(17,053	)
	Total		$	9,179		$	6,970		$	4,029		$	7,382		$	27,560
	Net income		$	4,734		$	3,604		$	3,396		$	4,510		$	16,244
	Earnings per share:
	Basic		$	0.51		$	0.38		$	0.36		$	0.48		$	1.73
	Diluted		$	0.5		$	0.38		$	0.36		$	0.48		$	1.72

Schedule_II_Valuation_and_Qual

Schedule II - Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2013
Valuation And Qualifying Accounts [Abstract]	'
Schedule II - Valuation and Qualifying Accounts	'
	Schedule II
	NORTHWEST PIPE COMPANY
	VALUATION AND QUALIFYING ACCOUNTS
	(Dollars in thousands)
		Balance at		Charged to		Deduction			Balance at
		Beginning		Profit and		from			End of
		of Period		Loss		Reserves			Period
	Year ended December 31, 2013:
	Allowance for doubtful accounts	$	1,748	$	124	$	(1,187	)	$	685
	Valuation allowance for deferred tax assets		940		954		—			1,894
	Year ended December 31, 2012:
	Allowance for doubtful accounts	$	1,650	$	1,381	$	(1,283	)	$	1,748
	Valuation allowance for deferred tax assets		926		14		—			940
	Year ended December 31, 2011:
	Allowance for doubtful accounts	$	2,151	$	3,518	$	(4,019	)	$	1,650
	Valuation allowance for deferred tax assets		105		872		(51	)		926

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and on various assumptions that are believed to be reasonable under the circumstances at that time. On an on-going basis, the Company evaluates all of its estimates, including those related to revenue recognition, allowance for doubtful accounts, goodwill, long-lived assets, including depreciation and amortization, inventories, income taxes, and litigation and other contingencies. Actual results could differ from those estimates under different assumptions or conditions.
Basis of Consolidation and Presentation	'
	Basis of Consolidation and Presentation
	The consolidated financial statements include the accounts of Northwest Pipe Company and its subsidiaries over which the Company exercises control as of the financial statement date. Intercompany accounts and transactions have been eliminated.
	Lucid Energy Inc. (“Lucid Energy”), over which the Company exercises significant influence but does not control, is accounted for under the cost method of accounting. Lucid Energy is a clean energy company based in Portland, Oregon. The carrying value of our investment is $0 at December 31, 2013 and 2012 due to a history of net losses by Lucid Energy.
Business Combinations and Acquisitions	'
	Business Combinations and Acquisitions
	The Company allocates the fair value of purchase consideration to the tangible assets acquired, liabilities assumed and intangible assets acquired based on their estimated fair values. The excess of the fair value of purchase consideration over the fair values of these identifiable assets and liabilities is recorded as goodwill. Such valuations require management to make significant estimates and assumptions, especially with respect to intangible assets. Contingent consideration is calculated and recorded at the date of the acquisition. During the measurement period, which does not exceed one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed as a result of information received regarding the valuation of assets and liabilities after the acquisition date, with the corresponding offset to goodwill. Upon the conclusion of the measurement period, any subsequent adjustments are recorded to earnings.
	On December 30, 2013 the Company acquired 100% of the outstanding shares of capital stock of Permalok Corporation, a fabricator of steel piping utilizing the Permalok interlocking pipe joining system. Permalok’s rolled and welded steel pipe products provide an alternate joint solution which complements and expands the Company’s product offerings in the Water Transmission segment. Total consideration (net of cash received) of $15.7 million was paid to the owners of the business, resulting in the recording of $5.3 million of goodwill, none of which is expected to be deductible for tax purposes. The goodwill recorded is attributed to synergies expected from integrating operations of Permalok with the rest of the Company’s Water Transmission business. The goodwill is included within the Water Transmission Group for purposes of segment reporting. Contingent consideration of $4.4 million was recorded in other long-term liabilities as of December 31, 2013, which represents the probability weighted contingent payment as a percentage of high, mid, and low revenue projections for the following three fiscal years. Contingent consideration at the acquisition date was estimated to be between $0.3 million and $5.2 million.
	Pro forma results of operations related to our acquisitions during the year ended December 31, 2013 have not been presented because they are not material to our Consolidated Statements of Operations, either individually or in the aggregate.
	On June 1, 2011, the Company sold all assets of the traffic systems product line of the Tubular Products facility in Houston, Texas. Assets sold as part of this sale included the (i) raw materials, work-in-process, finished goods and related fuel and supplies inventories, (ii) tangible personal property located at the Houston facilities or used by the Company in connection with the traffic business, including machinery, equipment, tooling, operating and maintenance manuals, parts and all other tangible assets used in or related to the traffic business, (iii) receivables, and (iv) other assets. Total consideration of $13.7 million was received, resulting in a gain of $2.9 million recognized in other expense during the second quarter of 2011. The calculation of the gain on sale included a write-off of $973,000 of goodwill.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Cash and cash equivalents consist of cash and short term highly liquid investments with remaining maturities of three months or less when purchased. At times, the Company will have outstanding checks in excess of related bank balances (a book overdraft). If this occurs, the amount of the book overdraft will be reclassified to Accounts Payable, and changes in the book overdraft will be reflected as a component of operating activities in the Consolidated Statements of Cash Flows. The Company did not have a book overdraft at December 31, 2013 or 2012.
Receivables and Allowance for Doubtful Accounts	'
	Receivables and Allowance for Doubtful Accounts
	Trade receivables are reported on the balance sheet net of any doubtful accounts. The Company maintains allowances for estimated losses resulting from the inability of its customers to make required payments or from contract disputes. The amounts of such allowances are based on Company history and management’s judgment. At least monthly, the Company reviews past due balances to identify the reasons for non-payment. The Company will write off a receivable account once the account is deemed uncollectible. The Company believes the reported allowances at December 31, 2013 and 2012 are adequate. If the customers’ financial conditions were to deteriorate resulting in their inability to make payments, or if contract disputes were to escalate, additional allowances may need to be recorded which would result in additional expenses being recorded for the period in which such determination was made.
Customer Prepayments	'
	Customer Prepayments
	Contractual terms may require prepayment of a portion of a contract value in advance of completing the work. Advanced deposits are recorded in accrued liabilities and are offset by invoices as work is performed on the contract. There were no advanced deposits at December 31, 2013. Advanced deposits totaled $9.4 million at December 31, 2012.
Inventories	'
	Inventories
	Inventories are stated at the lower of cost or market. Raw material inventories of steel are stated at cost, either on a specific identification basis or on an average cost basis. All other raw material inventories, as well as supplies, are stated on an average cost basis. Finished goods are stated at cost using the first-in, first-out method of accounting.
Property and Equipment	'
	Property and Equipment
	Property and equipment is stated at cost. Maintenance and repairs are expensed as incurred, and costs of new equipment and buildings, as well as costs of expansions or refurbishment of existing equipment and buildings, including interest where applicable, are capitalized. Depreciation and amortization are determined by the units of production method for most equipment and by the straight-line method for the remaining assets based on the estimated useful lives of the related assets. Estimated useful lives by major classes of property and equipment are as follows: Land improvements (15 – 30 years); Buildings (20 – 40 years); Machinery and equipment (3 – 30 years). Depreciation expense calculated under the units of production method may be less than, equal to, or greater than depreciation expense calculated under the straight-line method due to variances in production levels. Upon disposal, costs and related accumulated depreciation of the assets are removed from the accounts and resulting gains or losses are reflected in operating expenses. The Company leases certain equipment under long-term capital leases, which are being amortized on a straight-line basis over the shorter of its useful life or the lease term.
	The Company assesses impairment of property and equipment whenever changes in circumstances indicate that the carrying values of the asset or asset group(s) may not be recoverable. The asset group is the lowest level at which identifiable cash flows are largely independent of the cash flows of other groups of assets or liabilities. The recoverable value of long-lived asset group is determined by estimating future undiscounted cash flows using assumptions about the expected future operating performance of the Company.
	In conjunction with the preparation of the financial statements for the year ended December 31, 2013, the Company determined that an impairment triggering event as defined in ASC 360-10 had occurred for the assets located at its Bossier City, Louisiana facility. See Note 4, “Property and Equipment” for further discussion of the property and equipment impairment recorded during 2013.
Goodwill and Intangible Assets	'
	Goodwill and Intangible Assets
	Goodwill represents the excess of purchase price over the assigned fair values of the net assets in connection with an acquisition. Goodwill is reviewed for impairment annually at December 31 or whenever events occur or circumstances change that indicates goodwill may be impaired. Goodwill is tested for impairment at the reporting unit level. A reporting unit is an operating segment or one level below an operating segment (also known as a component). Our reporting units are equivalent to our operating segments as the individual components meet the criteria for aggregation.
	Intangible assets consist primarily of customer relationships, patents, and trade names and trademarks recorded as the result of acquisition activity. Intangible assets are amortized using the straight-line method over estimated useful lives ranging from 3 to 15 years.
	See Note 5, “Goodwill and Intangible Assets” for further discussion of the Company’s Goodwill and Intangible Asset balances.
Workers Compensation Insurance	'
	Workers Compensation Insurance
	The Company is self-insured, or maintains high deductible policies, for losses and liabilities associated with workers compensation claims. Losses are accrued based upon the Company’s estimates of the aggregate liability for claims incurred using historical experience and certain actuarial assumptions followed in the insurance industry.
Pension Benefits	'
	Pension Benefits
	The Company has two defined benefit pension plans that have been frozen since 2001. The Company funds these plans to cover current plan costs plus amortization of the unfunded plan liabilities. To record these obligations, management uses estimates relating to investment returns, mortality, and discount rates. Management reviews all of these assumptions on an annual basis.
Derivative Instruments	'
	Derivative Instruments
	The Company conducts business in foreign countries, and, from time to time, settles transactions in foreign currencies. The Company has established a program that utilizes foreign currency forward contracts to offset the risk associated with the effects of certain foreign currency exposures, typically arising from sales contracts denominated in Canadian currency. Foreign currency forward contracts are consistent with the Company’s strategy for financial risk management. The Company utilizes cash flow hedge accounting treatment for qualifying foreign currency forward contracts. Instruments that do not qualify for cash flow hedge accounting treatment are remeasured at fair value at each balance sheet date and resulting gains and losses are recognized in net income (loss).
Foreign Currency Transactions	'
	Foreign Currency Transactions
	Assets and liabilities subject to foreign currency fluctuations are translated into United States dollars at the period-end exchange rate, and revenue and expenses are translated at exchange rates representing an average for the period. Translation adjustments from designated hedges are included in accumulated other comprehensive loss as a separate component of stockholders’ equity. Gains or losses on all other foreign currency transactions are recognized in the statement of operations. The functional currency of the Company’s Mexican operations is the United States dollar.
Revenue Recognition	'
	Revenue Recognition
	Revenue from construction contracts in the Company’s Water Transmission Group is recognized on the percentage-of-completion method. For a majority of contracts, revenue is measured by the costs incurred to date as a percentage of the estimated total costs of each contract (cost-to-cost method). For a small number of contracts, revenue is measured using units of delivery as progress is best estimated by the number of units delivered under the contract. Contract costs include all direct material and labor costs and those indirect costs related to contract performance, such as indirect labor, supplies, tools, repairs and depreciation. Selling, general and administrative costs are charged to expense as incurred. The cost of steel is recognized as a project cost when the steel is introduced into the manufacturing process. Estimated total costs of each contract are reviewed on a monthly basis by project management and operations personnel for all active projects. All cost revisions that result in the gross profit as a percent of sales increasing or decreasing by more than two percent are reviewed by senior management personnel.
	The Company begins recognizing revenue on a project when persuasive evidence of an arrangement exists, recoverability is reasonably assured, and project costs are incurred. Costs may be incurred before the Company has persuasive evidence of an arrangement. In those cases, if recoverability from that arrangement is probable, the project costs are deferred and revenue recognition is delayed.
	Changes in job performance, job conditions and estimated profitability, including those arising from contract change orders, contract penalty provisions, foreign currency exchange rate movements, changes in raw materials costs, and final contract settlements may result in revisions to estimates of revenue, costs and income and are recognized in the period in which the revisions are determined. Provisions for losses on uncompleted contracts are made in the period such losses are known.
	Revenue from the Company’s Tubular Products Group is recognized when all four of the following criteria have been satisfied: persuasive evidence of an arrangement exists, the price is fixed or determinable, delivery has occurred, and collectability is reasonably assured. Deferred revenue is recorded when the manufacturing process is complete and customers are invoiced prior to physical delivery of the product.
Income Taxes	'
	Income Taxes
	Income taxes are recorded using an asset and liability approach that requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the Company’s financial statements or tax returns. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount expected to be realized. The determination of the provision for income taxes requires significant judgment, the use of estimates and the interpretation and application of complex tax laws. The provision for income taxes primarily reflects a combination of income earned and taxed in the various United States federal and state and, to a lesser extent, foreign jurisdictions. Jurisdictional tax law changes, increases or decreases in permanent differences between book and tax items, accruals or adjustments of accruals for unrecognized tax benefits or valuation allowances, and the change in the mix of earnings from these taxing jurisdictions all affect the overall effective tax rate.
	The Company records tax reserves for federal, state, local and international exposures relating to periods subject to audit. The development of reserves for these exposures requires judgments about tax issues, potential outcomes and timing, and is a subjective estimate. The Company assesses tax positions and records tax benefits for all years subject to examination based upon management’s evaluation of the facts, circumstances, and information available at the reporting dates. For those tax positions where it is more-likely-than-not that a tax benefit will be sustained, the largest amount of tax benefit with a greater than 50% likelihood of being realized upon settlement with a tax authority that has full knowledge of all relevant information has been recorded. For those tax positions where it is not more-likely-than-not that a tax benefit will be sustained, no tax benefit has been recognized in the financial statements.
Accumulated Other Comprehensive Loss	'
	Accumulated Other Comprehensive Loss
	Accumulated other comprehensive loss includes unrealized gains and losses on derivative instruments related to the effective portion of cash flow hedges and changes in the funded status of the defined benefit pension plans, both net of the related income tax effect. For further information, refer to Note 16, “Accumulated Other Comprehensive Loss”.
Earnings (Loss) per Share	'
	Earnings (Loss) per Share
	Earnings (loss) per basic and diluted weighted average common shares outstanding was calculated as follows for the years ended December 31 (in thousands, except per share data):
			2013			2012		2011
	Net income (loss) (in thousands)		$	(923	)	$	16,244	$	12,660
	Basic weighted-average common shares outstanding			9,445			9,377		9,333
	Effect of potentially dilutive common shares (1)			—			68		51
	Diluted weighted-average common shares outstanding			9,445			9,445		9,384
	Earnings (loss) per common share:
	Earnings (loss) per basic common share		$	(0.10	)	$	1.73	$	1.36
	Earnings (loss) per diluted common share			(0.10	)		1.72		1.35
	Antidilutive shares excluded from net earnings per diluted common share calculation			93			92		58
	-1	Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.
Concentrations of Credit Risk	'
	Concentrations of Credit Risk
	Financial instruments, which potentially subject the Company to concentrations of credit risk, consist principally of trade receivables, derivative contracts, the escrow account and non-qualified retirement savings plan assets. Trade receivables generally represent a large number of customers, including municipalities, manufacturers, distributors and contractors, dispersed across a wide geographic base. At December 31, 2013, two customers had a balance in excess of 10% of total accounts receivable. At December 31, 2012, no customer had a balance in excess of 10% of total accounts receivable. Derivative contracts are with a financial institution rated A-1 by S&P. The Company’s non-qualified retirement savings plan assets, also included in other assets, are invested in a diversified portfolio of stock and bond mutual funds.
Share-based Compensation	'
	Share-based Compensation
	The Company recognizes the compensation cost of employee and director services received in exchange for awards of equity instruments based on the grant date estimated fair value of the awards. Share-based compensation cost is recognized over the period during which the employee or director is required to provide service in exchange for the award, and as forfeitures occur, the associated compensation cost recognized to date is reversed. Share-based compensation cost related to awards with a performance-based condition is recognized based on the probable outcome of the performance conditions, which requires judgment.
	The Company estimates the fair value of stock options using the Black-Scholes-Merton option pricing model. The Black-Scholes-Merton option pricing model requires the Company to estimate key assumptions such as expected term, volatility, risk-free interest rates and dividend yield to determine the fair value of stock options, based on both historical information and management judgment regarding market factors and trends. The Company estimates the fair value of Restricted Stock Units (“RSUs”) and Performance Stock Awards (“PSAs”) using the value of the Company’s stock on the date of grant, with the exception of market-based PSAs, for which a Monte Carlo simulation model is used. The Monte Carlo simulation model calculates many potential outcomes for an award and estimates fair value based on the most likely outcome.
	See Note 12, “Share-based Compensation Plans” for further discussion of the Company’s share-based compensation.
Recent Accounting and Reporting Developments	'
	Recent Accounting and Reporting Developments
	Accounting Changes
	In December 2011, the FASB issued ASU 2011-11 which requires companies to disclose information regarding offsetting and other arrangements for derivatives and other financial instruments. In January 2013, the FASB issued ASU 2013-01, which limited the scope of the balance sheet offsetting disclosures to derivatives, repurchase agreements, and securities lending transactions to the extent that they are (1) offset in the financial statements or (2) subject to an enforceable master netting arrangement or similar agreement. This guidance is effective for interim and annual periods beginning on or after January 1, 2013. The Company adopted this guidance on January 1, 2013 and has made the required additional disclosures.
	In February 2013, the FASB issued ASU 2013-02, which clarified the reclassification requirements of ASU 2011-05 which were previously delayed by the FASB in October 2011. Reclassification adjustments which are not reclassified from other comprehensive income to net income in their entirety may instead be parenthetically cross referenced to the related footnote on the face of the financial statements for additional information. This guidance is effective for interim and annual reporting periods beginning after December 15, 2012. The Company adopted this guidance on January 1, 2013 and has made the required additional disclosures.
	In July 2013, the FASB issued ASU 2013-10, which allowed for the use of the Fed Funds Effective Swap rate (or Overnight Index Swap rate) as a benchmark interest rate for hedge accounting purposes and removes the restriction on using different benchmark rates for similar hedges. This guidance is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this guidance did not have an impact on the Company’s consolidated financial position or results of operation.
	Recent Accounting Standards
	In July 2013, the FASB issued ASU 2013-11, which clarified guidance on the presentation of unrecognized tax benefits. The guidance requires that an unrecognized tax benefit, or portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward when such items exist in the same taxing jurisdiction. This guidance is effective for interim and annual periods beginning after December 15, 2013, with early adoption permitted. The amendments should be applied prospectively to all unrecognized tax benefits that exist at the effective date, and retrospective application is permitted. The adoption of this guidance is not expected to have a significant impact on the Company’s consolidated financial position.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Earnings (Loss) per Basic and Diluted Weighted Average Common Shares Outstanding	'
	Earnings (loss) per basic and diluted weighted average common shares outstanding was calculated as follows for the years ended December 31 (in thousands, except per share data):
			2013			2012		2011
	Net income (loss) (in thousands)		$	(923	)	$	16,244	$	12,660
	Basic weighted-average common shares outstanding			9,445			9,377		9,333
	Effect of potentially dilutive common shares (1)			—			68		51
	Diluted weighted-average common shares outstanding			9,445			9,445		9,384
	Earnings (loss) per common share:
	Earnings (loss) per basic common share		$	(0.10	)	$	1.73	$	1.36
	Earnings (loss) per diluted common share			(0.10	)		1.72		1.35
	Antidilutive shares excluded from net earnings per diluted common share calculation			93			92		58
	-1	Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.

Costs_and_Estimated_Earnings_i1

Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Schedule of Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings	'
	Billings in excess of costs and estimated earnings represents amounts billed based on the terms of the contracts in advance of costs incurred and revenue earned.
		December 31,
		2013			2012
		(in thousands)
	Costs incurred on uncompleted contracts	$	182,709		$	211,801
	Estimated earnings		37,438			32,480
			220,147			244,281
	Less billings to date		(173,047	)		(177,445	)
		$	47,100		$	66,836
	Amounts are presented in the Consolidated Balance Sheets as follows:
	Costs and estimated earnings in excess of billings on uncompleted contracts	$	50,468		$	73,314
	Billings in excess of costs and estimated earnings on uncompleted contracts		(3,368	)		(6,478	)
		$	47,100		$	66,836

Inventories_Tables

Inventories (Tables)	12 Months Ended
	Dec. 31, 2013
Inventory Disclosure [Abstract]	'
Components of Inventories	'
	Inventories are stated at the lower of cost or market and consist of the following (in thousands):
		December 31,
		2013		2012
	Short-term inventories:
	Raw materials	$	52,598	$	56,913
	Work-in-process		4,902		10,157
	Finished goods		49,351		43,374
	Supplies		3,541		3,101
			110,392		113,545
	Long-term inventories:
	Finished goods		1,249		1,608
	Total inventories	$	111,641	$	115,153

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Summary of Property and Equipment	'
	Property and equipment consists of the following (in thousands):
		December 31,
		2013			2012
	Land and improvements	$	24,240		$	23,651
	Buildings		42,763			39,834
	Machinery and equipment		136,581			155,276
	Equipment under capital lease		14,196			21,452
	Construction in progress		14,115			9,906
			231,895			250,119
	Less accumulated depreciation and amortization		(88,834	)		(97,574	)
	Property and equipment, net	$	143,061		$	152,545

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Schedule of Goodwill	'
	Goodwill assigned to the Company’s Water Transmission and Tubular Products groups is as follows (in thousands):
			Water Transmission		Tubular Products		Total
	Goodwill balance, December 31, 2011		$	—	$	20,478	$	20,478
	Goodwill balance, December 31, 2012			—		20,478		20,478
	Additions			5,282		—		5,282
	Goodwill balance, December 31, 2013		$	5,282	$	20,478	$	25,760
Summary of Intangible Assets	'
	Intangible assets consist of the following (in thousands):
			Gross Carrying		Accumulated		Intangible		Weighted-Average
			Amount		Amortization		Assets, Net		Amortization Period
									(in years)
	Customer relationships		$	1,378	$	—	$	1,378		10
	Patents			1,162		—		1,162		5
	Trade names and trademarks			1,132		—		1,132		15
	Other (1)			295		—		295		4.5
	Total		$	3,967	$	—	$	3,967		9.6
	-1	Other intangibles consist of favorable lease contracts and non-compete agreements
Summary of Estimated Amortization Expense	'
	The estimated amortization expense for the next five fiscal years is as follows (in thousands):
	2014		$	513
	2015			513
	2016			513
	2017			504
	2018			481
	Thereafter			1,443
			$	3,967

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Long-Term Debt	'
		December 31,
		2013		2012
		(in thousands)
	Series A Term Note, maturing on February 25, 2014, due in annual payments of $2.1 million that began February 25, 2008, plus interest at 10.50% paid quarterly, on February 25, May 25, August 25 and November 25, collateralized by accounts receivable, inventory and certain equipment	$	2,143	$	4,286
	Series B Term Note, maturing on June 21, 2014, due in annual payments of $1.5 million that began June 21, 2008, plus interest at 10.22% paid quarterly, on March 21, June 21, September 21 and December 21, collateralized by accounts receivable, inventory and certain equipment		1,500		3,000
	Series C Term Note, maturing on October 26, 2014, due in annual payments of $1.4 million that began October 26, 2008, plus interest at 9.11% paid quarterly, on January 26, April 26, July 26 and October 26, collateralized by accounts receivable, inventory and certain equipment		1,429		2,857
	Series D Term Note, maturing on January 24, 2015, due in annual payments of $643,000 that began January 24, 2009, plus interest at 9.07% paid quarterly, on January 24, April 24, July 24 and October 24, collateralized by accounts receivable, inventory and certain equipment		1,285		1,928
	Total long-term debt	$	6,357	$	12,071
	Amounts are presented in the Consolidated Balance Sheets as follows:
	Current portion of long-term debt	$	5,714	$	5,714
	Long-term debt, less current portion		643		6,357
		$	6,357	$	12,071
Future Principal Payments of Long-Term Debt	'
	Future principal payments of long-term debt are as follows (in thousands):
	2014	$	5,714
	2015		643
	2016		—
	2017		—
	2018		—
	Thereafter		—
		$	6,357

Leases_Tables

Leases (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Schedule of Future Minimum Lease Payments for Capital Leases	'
	The future minimum payments under the Company’s capital leases are as follows (in thousands):
	2014	$	2,697
	2015		2,697
	2016		2,145
	2017		1,315
	2018		—
	Thereafter		—
	Total minimum lease payments		8,854
	Amount representing interest		(958	)
	Present value of minimum lease payments with average interest rates of 7.04%		7,895
	Current portion of capital lease obligation		2,216
	Capital lease obligation, less current portion	$	5,679
Schedule of Future Minimum Lease Payments for Operating Leases	'
	Future minimum payments as of December 31, 2013 for operating leases with initial or remaining terms in excess of one year are (in thousands):
	2014	$	2,733
	2015		2,501
	2016		2,225
	2017		1,846
	2018		688
	Thereafter		753
		$	10,746

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table summarizes information regarding the Company’s financial assets and financial liabilities that are measured at fair value on a recurring basis (in thousands):
		Balance at			Level 1		Level 2			Level 3
		December 31,
		2013
	Description
	Financial Assets
	Non – qualified retirement savings plan assets	$	6,000		$	4,944	$	1,056		$	—
	Derivatives		1			—		1			—
	Total Assets	$	6,001		$	4,944	$	1,057		$	—
	Financial Liabilities
	Contingent consideration	$	(4,425	)	$	—	$	—		$	(4,425	)
	Derivatives		(1	)		—		(1	)		—
	Total Liabilities	$	(4,426	)	$	—	$	(1	)	$	(4,425	)
		Balance at			Level 1		Level 2			Level 3
		December 31,
		2012
	Description
	Financial Assets
	Escrow account	$	898		$	898	$	—		$	—
	Non – qualified retirement savings plan assets		5,280			5,280		—			—
	Total Assets	$	6,178		$	6,178	$	—		$	—
	Financial Liabilities
	Derivatives	$	(353	)	$	—	$	(353	)	$	—

ShareBased_Compensation_Plans_

Share-Based Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Share-Based Compensation Expense	'
	The following summarizes share-based compensation expense recorded:
		Year ended December 31,
		2013			2012		2011
		(in thousands)
	Cost of sales	$	662		$	432	$	143
	Selling, general and administrative expenses		2,398			2,616		1,318
	Total	$	3,060		$	3,048	$	1,461
Summary of Status of Company's Stock Options	'
	A summary of status of the Company’s stock options as of December 31, 2013 and changes during the three years then ended is presented below:
		Options			Weighted		Weighted		Aggregate
					Average		Average		Intrinsic
					Exercise		Remaining		Value
					Price		Contractual
							Life
							(in years)		(in thousands)
	Balance, December 31, 2010		145,209		$	17.64
	Options granted		—			—
	Options exercised or exchanged		(73,612	)		14.12
	Options cancelled		—			—
	Balance, December 31, 2011		71,597			21.26
	Options granted		—			—
	Options exercised or exchanged		(24,597	)		17.58
	Options cancelled		—			—
	Balance, December 31, 2012		47,000			23.19
	Options granted		—			—
	Options exercised or exchanged		(7,000	)		10.31
	Options cancelled		—			—
	Balance, December 31, 2013		40,000			25.44
	Exercisable and Outstanding, December 31, 2013		40,000			25.44		4.65	$	493
Summary of Information about Stock Options Outstanding	'
	The following table summarizes information about stock options outstanding at December 31, 2013:
	Options Outstanding								Options Exercisable
	Range of Exercise	Number of			Weighted Average		Weighted Average		Number of		Weighted Average
	Prices Per Share	Options			Remaining		Exercise Price Per		Options		Exercise Price Per
					Contractual Life		Share				Share
					(years)
	$14.00		2,000			0.36		14		2,000		14
	$22.07		4,000			1.36		22.07		4,000		22.07
	$24.15		24,000			6.25		24.15		24,000		24.15
	$28.31		4,000			2.36		28.31		4,000		28.31
	$34.77		6,000			3.41		34.77		6,000		34.77
			40,000			4.65		25.44		40,000		25.44
Summary of Status of Company's RSUs and PSAs	'
	A summary of status of the Company’s RSUs and PSAs as of December 31, 2013 and changes during the three years then ended is presented below:
		Number of			Weighted
		RSUs and			Average Grant
		PSAs			Date Fair
					Value
	Unvested RSUs and PSAs at December 31, 2010		55,843		$	37
	RSUs and PSAs granted		174,891			23.32
	Unvested RSUs and PSAs cancelled		(20,997	)		47.46
	RSUs and PSAs vested		(15,756	)		26.27
	Unvested RSUs and PSAs at December 31, 2011		193,981			24.41
	RSUs and PSAs granted		115,306			29.06
	Unvested RSUs and PSAs cancelled		(39,306	)		28.44
	RSUs and PSAs vested		(26,840	)		23.13
	Unvested RSUs and PSAs at December 31, 2012		243,141			26.11
	RSUs and PSAs granted		117,966			34.24
	Unvested RSUs and PSAs cancelled		(16,002	)		27.45
	RSUs and PSAs vested		(88,018	)		23.37
	Unvested RSUs and PSAs at December 31, 2013		257,087		$	30.69

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Provision for Income Taxes	'
	The components of the provision for (benefit from) income taxes are as follows:
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
	Current:
	Federal	$	5,737		$	5,428		$	2,639
	State		566			130			695
	Total current tax expense		6,303			5,558			3,334
	Deferred:
	Federal		(7,319	)		(296	)		5,380
	State		(1,110	)		259			904
	Total deferred tax expense		(8,429	)		(37	)		6,284
		$	(2,126	)	$	5,521		$	9,618
Schedule of Effective Income Tax Rate Reconciliation	'
	The difference between the Company’s effective income tax rates and the statutory United States federal income tax rate of 35% is explained as follows:
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
	Provision (benefit) at statutory rate of 35%	$	(1,067	)	$	7,618		$	7,800
	State provision, net of federal benefit		(393	)		519			922
	Research and development credits		(916	)		(1,734	)		—
	Domestic manufacturing deduction		(641	)		(762	)		(389	)
	Sale of business		—			—			341
	Change in valuation allowance		954			—			872
	Uncertain tax positions		(311	)		(67	)		126
	Nondeductible expenses		370			278			190
	Other		(122	)		(331	)		(244	)
		$	(2,126	)	$	5,521		$	9,618
	Effective tax (benefit) rate		(69.7	)%		25.4	%		43.2	%
Schedule of Current and Noncurrent Deferred Tax Assets and Liabilities	'
	The tax effect of temporary differences that give rise to significant portions of deferred tax assets and liabilities is presented below:
		December 31,
		2013			2012
		(in thousands)
	Current deferred tax assets:
	Costs and estimated earnings in excess of billings on uncompleted contracts, net	$	2,384		$	1,323
	Accrued employee benefits		951			1,612
	Inventories		2,671			1,393
	Trade receivable, net		319			650
	Net operating loss carryforwards		500			364
	Other		520			693
			7,345			6,035
	Valuation allowance		(500	)		(146	)
			6,845			5,889
	Current deferred tax liabilities:
	Prepaid expenses		(637	)		(712	)
	Current deferred tax assets, net		6,208			5,177
	Noncurrent deferred tax assets:
	Net operating loss carryforwards		211			549
	Tax credit carryforwards		478			64
	Accrued employee benefits		3,740			3,673
	Other assets		5,520			4,527
	Other		138			17
			10,087			8,830
	Valuation allowance		(1,394	)		(794	)
			8,693			8,036
	Noncurrent deferred tax liabilities:
	Property and equipment		(19,343	)		(23,290	)
	Intangible assets		(1,192	)		—
	Noncurrent deferred tax liabilities, net		(11,842	)		(15,254	)
	Net deferred tax liabilities	$	(5,634	)	$	(10,077	)
Schedule of Unrecognized Tax Benefits	'
	A summary of the changes in the unrecognized tax benefits during the years ended December 31, 2013, 2012 and 2011 is presented below (in thousands):
		2013			2012			2011
	Unrecognized tax benefits, beginning of year	$	5,245		$	309		$	125
	Increases for positions taken in prior years		646			3,571			10
	Decreases for positions taken in prior years		(696	)		(184	)		—
	Increases for positions taken in the current year		1,012			1,549			174
	Unrecognized tax benefits, end of year	$	6,207		$	5,245		$	309

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Summary of Accumulated Other Comprehensive Loss	'
	Accumulated other comprehensive loss consists of the following (in thousands):
		December 31,
		2013			2012
	Pension liability adjustment, net of tax benefit of $704 and $1,244	$	(1,275	)	$	(2,188	)
	Deferred gain (loss) on cash flow derivatives, net of tax expense of $9 and benefit of $50		14			(85	)
	Total	$	(1,261	)	$	(2,273	)
Schedule of Components of Accumulated Other Comprehensive Income (Loss)	'
	The following table summarizes changes in the components of accumulated other comprehensive income (loss) during the twelve months ended December 31, 2013 and December 31, 2012 (in thousands). All amounts are net of tax:
		Defined Benefit			Gains (Losses) on			Total
		Pension Items			Cash Flow
					Hedges
	Balance, December 31, 2011	$	(2,326	)	$	14		$	(2,312	)
	Other comprehensive loss before reclassifications		(175	)		(120	)		(295	)
	Amounts reclassified from accumulated other comprehensive income (loss)		313			21			334
	Net current period other comprehensive income (loss)		138			(99	)		39
	Balance, December 31, 2012	$	(2,188	)	$	(85	)	$	(2,273	)
	Other comprehensive income before reclassifications		674			171			803
	Amounts reclassified from accumulated other comprehensive income (loss)		239			(72	)		209
	Net current period other comprehensive income		913			99			1,012
	Balance, December 31, 2013	$	(1,275	)	$	14		$	(1,261	)
Schedule of Reclassifications of Accumulated Other Comprehensive Income (Loss)	'
	The following table provides additional detail about accumulated other comprehensive income (loss) components which were reclassified to the Consolidated Statements of Operations during the twelve months ended December 21, 2013, 2012 and 2011 (in thousands):
	Details about Accumulated Other	Amount reclassified from Accumulated Other									Affected line item in the
	Comprehensive Income (Loss) Components	Comprehensive Income (Loss)									Consolidated
											Statements of Operations
		2013			2012			2011
	Defined Benefit Pension Items
	Net periodic pension cost	$	(372	)	$	(417	)	$	(266	)	Cost of sales
			133			104			90		Tax benefit
		$	(239	)	$	(313	)	$	(176	)	Net of tax
	Gains and (losses) on cash flow hedges
	Foreign currency forward contracts	$	114		$	(40	)	$	(501	)	Net sales
			(42	)		19			183		Tax (expense) benefit
		$	72		$	(21	)	$	(318	)	Net of tax
	Total reclassifications for the period	$	(209	)	$	(334	)	$	(494	)

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information Report of Statements of Operations	'
	As of December 31, 2013, all material long-lived assets are located in the United States.
		Year Ended December 31,
		2013			2012			2011
		(in thousands)
	Net sales:
	Water transmission	$	226,427		$	269,203		$	271,885
	Tubular products		249,129			255,300			239,783
	Total	$	475,556		$	524,503		$	511,668
	Gross profit:
	Water transmission	$	46,953		$	45,051		$	43,182
	Tubular products		5,506			11,147			15,956
	Total	$	52,459		$	56,198		$	59,138
	Operating income (loss):
	Water transmission	$	40,343		$	36,278		$	34,113
	Tubular products		(24,843	)		8,335			12,660
			15,500			44,613			46,773
	Corporate		(14,751	)		(17,053	)		(13,950	)
	Total	$	749		$	27,560		$	32,823
	Depreciation and amortization expense:
	Water transmission	$	7,082		$	10,474		$	8,729
	Tubular products		5,963			5,541			5,723
			13,045			16,015			14,452
	Corporate		254			252			69
	Total	$	13,299		$	16,267		$	14,521
	Capital expenditures:
	Water transmission	$	13,204		$	6,830		$	4,765
	Tubular products		14,354			9,813			11,386
			27,558			16,643			16,151
	Corporate		889			146			182
	Total	$	28,447		$	16,789		$	16,333
	Net sales by geographic region:
	United States	$	441,779		$	473,403		$	455,625
	Other		33,777			51,100			56,043
	Total	$	475,556		$	524,503		$	511,668
Segment Information Report of Balance Sheets	'
		December 31,
		2013			2012
		(in thousands)
	Goodwill:
	Water transmission	$	5,282		$	—
	Tubular products		20,478			20,478
	Total	$	25,760		$	20,478
	Total assets:
	Water transmission	$	218,849		$	221,987
	Tubular products		184,088			174,591
			402,937			396,578
	Corporate		30,522			25,844
	Total	$	433,459		$	422,422

Quarterly_Data_Tables

Quarterly Data (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Summary of Quarterly Financial Data	'
	Summarized quarterly financial data for 2013 and 2012 is as follows (dollars in thousands, except per share).
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	For the year ended December 31, 2013
	Net sales:
	Water transmission	$	78,613		$	58,148		$	46,835		$	42,831		$	226,427
	Tubular products		61,984			58,590			56,187			72,368			249,129
	Total	$	140,597		$	116,738		$	103,022		$	115,199		$	475,556
	Gross profit (loss):
	Water transmission	$	19,870		$	12,125		$	7,932		$	7,026		$	46,953
	Tubular products		1,334			3,543			880			(251	)		5,506
	Total	$	21,204		$	15,668		$	8,812		$	6,775		$	52,459
	Operating income (loss):
	Water transmission	$	18,033		$	10,499		$	6,306		$	5,505		$	40,343
	Tubular products		666			2,885			93			(28,487	)		(24,843	)
	Corporate		(3,879	)		(4,004	)		(3,559	)		(3,309	)		(14,751	)
	Total	$	14,820		$	9,380		$	2,840		$	(26,291	)	$	749
	Net income (loss)	$	9,506		$	5,561		$	1,016		$	(17,006	)	$	(923	)
	Earnings (loss) per share:
	Basic	$	1.01		$	0.59		$	0.11		$	(1.80	)	$	(0.10	)
	Diluted	$	1		$	0.59		$	0.11		$	(1.80	)	$	(0.10	)
		First			Second			Third			Fourth			Total
		Quarter			Quarter			Quarter			Quarter
	For the year ended December 31, 2012
	Net sales:
	Water transmission	$	58,431		$	59,050		$	63,487		$	88,235		$	269,203
	Tubular products		83,744			71,991			51,612			47,953			255,300
	Total	$	142,175		$	131,041		$	115,099		$	136,188		$	524,503
	Gross profit:
	Water transmission	$	9,699		$	8,149		$	9,681		$	17,522		$	45,051
	Tubular products		6,801			5,428			1,919			(3,001	)		11,147
	Total	$	16,500		$	13,577		$	11,600		$	14,521		$	56,198
	Operating income (loss):
	Water transmission	$	8,024		$	6,130		$	6,969		$	15,155		$	36,278
	Tubular products		6,196			4,651			1,134			(3,646	)		8,335
	Corporate		(5,041	)		(3,811	)		(4,074	)		(4,127	)		(17,053	)
	Total	$	9,179		$	6,970		$	4,029		$	7,382		$	27,560
	Net income	$	4,734		$	3,604		$	3,396		$	4,510		$	16,244
	Earnings per share:
	Basic	$	0.51		$	0.38		$	0.36		$	0.48		$	1.73
	Diluted	$	0.5		$	0.38		$	0.36		$	0.48		$	1.72

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

12 Months Ended

Jun. 30, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 30, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Customer

Customer

Permalok Corporation [Member]

Permalok Corporation [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Segment

Permalok Corporation [Member]

Land Improvements [Member]

Buildings [Member]

Machinery and Equipment [Member]

Permalok Corporation [Member]

Land Improvements [Member]

Buildings [Member]

Machinery and Equipment [Member]

Pension_Plan

Summary Of Significant Accounting Policies [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of reportable segments

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

Carrying value of investment

'

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

Business acquisition date

'

'

'

'

30-Dec-13

'

'

'

'

'

'

'

'

'

'

Business acquisition, percentage

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

Business acquisition (net of received), amount paid

'

15,689,000

'

'

15,700,000

'

'

'

'

'

'

'

'

'

'

Business acquisition, goodwill

'

5,282,000

'

5,300,000

'

'

'

'

'

'

'

'

'

'

'

Business acquisition, contingent consideration recorded

'

'

'

'

4,400,000

'

300,000

'

'

'

'

5,200,000

'

'

'

Proceeds from sale of traffic systems assets

13,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain on sale of traffic systems assets

2,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill written off related to sale of traffic systems assets

973,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Advanced deposits

'

$0

$9,400,000

'

'

'

'

'

'

'

'

'

'

'

'

Estimated useful lives of property and equipment

'

'

'

'

'

'

'

'15 years

'20 years

'3 years

'

'

'30 years

'40 years

'30 years

Estimated useful lives of intangible assets

'

'9 years 7 months 6 days

'

'

'

'3 years

'

'

'

'

'15 years

'

'

'

'

Number of defined benefit pension plans

'

2

'

'

'

'

'

'

'

'

'

'

'

'

'

Change in gross profit which triggers senior management review

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum likelihood of tax benefit being realized in order for tax benefit to be recorded

'

50.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of customers with balances in excess of 10% of total accounts receivable

'

2

0

'

'

'

'

'

'

'

'

'

'

'

'

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Summary of Earnings (Loss) per Basic and Diluted Weighted Average Common Shares Outstanding (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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
Earnings Per Share [Abstract]	'	'	'	'	'	'	'	'	'	'	'
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 weighted-average common shares outstanding	'	'	'	'	'	'	'	'	9,445	9,377	9,333
Effect of potentially dilutive common shares	'	'	'	'	'	'	'	'	'	68	51
Diluted weighted-average common shares outstanding	'	'	'	'	'	'	'	'	9,445	9,445	9,384
Earnings (loss) per common share:	'	'	'	'	'	'	'	'	'	'	'
Earnings (loss) per basic common share	($1.80)	$0.11	$0.59	$1.01	$0.48	$0.36	$0.38	$0.51	($0.10)	$1.73	$1.36
Earnings (loss) per diluted common share	($1.80)	$0.11	$0.59	$1	$0.48	$0.36	$0.38	$0.50	($0.10)	$1.72	$1.35
Antidilutive shares excluded from net earnings per diluted common share calculation	'	'	'	'	'	'	'	'	93	92	58

Costs_and_Estimated_Earnings_i2

Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings - Schedule of Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts and Billings in Excess of Costs and Estimated Earnings (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Contractors [Abstract]	'	'
Costs incurred on uncompleted contracts	$182,709	$211,801
Estimated earnings	37,438	32,480
Sum of costs incurred and estimated earnings on uncompleted contracts	220,147	244,281
Less billings to date	-173,047	-177,445
Amounts are presented in the Consolidated Balance Sheets as follows:	'	'
Costs and estimated earnings in excess of billings on uncompleted contracts	50,468	73,314
Billings in excess of costs and estimated earnings on uncompleted contracts	-3,368	-6,478
Total, net	$47,100	$66,836

Inventories_Components_of_Inve

Inventories - Components of Inventories (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Short-term inventories:	'	'
Raw materials	$52,598	$56,913
Work-in-process	4,902	10,157
Finished goods	49,351	43,374
Supplies	3,541	3,101
Total short-term inventories	110,392	113,545
Long-term inventories:	'	'
Finished goods	1,249	1,608
Total inventories	$111,641	$115,153

Property_and_Equipment_Summary

Property and Equipment - Summary of Property and Equipment (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$231,895	$250,119
Less accumulated depreciation and amortization	-88,834	-97,574
Property and equipment, net	143,061	152,545
Land and Improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	24,240	23,651
Buildings [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	42,763	39,834
Machinery and Equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	136,581	155,276
Equipment Under Capital Lease [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	14,196	21,452
Construction in Progress [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Property and equipment, gross	$14,115	$9,906

Property_and_Equipment_Additio

Property and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Plant And Equipment [Abstract]	'	'	'
Depreciation and amortization expense	$13,299,000	$16,267,000	$14,471,000
Accumulated amortization of property and equipment under capital leases	4,900,000	8,600,000	'
Asset impairment charge	$27,500,000	'	'

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets - Schedule of Goodwill (Detail) (USD $)	12 Months Ended		12 Months Ended			12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2011	Dec. 30, 2013	Dec. 31, 2013	Dec. 31, 2011
			Water Transmission [Member]	Water Transmission [Member]	Tubular Products [Member]	Tubular Products [Member]	Tubular Products [Member]
			Operating Segments [Member]	Operating Segments [Member]		Operating Segments [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

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2011	Dec. 31, 2012	Dec. 30, 2013	Dec. 31, 2013
				Tubular Products [Member]	Permalok Corporation [Member]
Goodwill [Line Items]	'	'	'	'	'
Accumulated impairment charges	$0	'	$0	'	'
Goodwill	25,760,000	20,478,000	20,478,000	20,500,000	5,300,000
Amortization expense	'	$50,000	'	'	'

Goodwill_and_Intangible_Assets4

Goodwill and Intangible Assets - Summary of Intangible Assets (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Amount	$3,967
Accumulated Amortization	'
Total	3,967
Weighted Average Amortization Period	'9 years 7 months 6 days
Customer Relationships [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Amount	1,378
Accumulated Amortization	'
Total	1,378
Weighted Average Amortization Period	'10 years
Patents [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Amount	1,162
Accumulated Amortization	'
Total	1,162
Weighted Average Amortization Period	'5 years
Trade Names and Trademarks [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Amount	1,132
Accumulated Amortization	'
Total	1,132
Weighted Average Amortization Period	'15 years
Other [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Gross Carrying Amount	295
Accumulated Amortization	'
Total	$295
Weighted Average Amortization Period	'4 years 6 months

Goodwill_and_Intangible_Assets5

Goodwill and Intangible Assets - Summary of Estimated Amortization Expense (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'
2014	$513
2015	513
2016	513
2017	504
2018	481
Thereafter	1,443
Total	$3,967

Note_Payable_to_Financial_Inst1

Note Payable to Financial Institution - Additional Information (Detail) (USD $)	12 Months Ended				1 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
			London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	Prime Rate [Member]	Prime Rate [Member]
					Minimum [Member]	Maximum [Member]	Minimum [Member]	Maximum [Member]
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Credit agreement interest rate	'	'	2.00%	2.00%	1.75%	2.75%	0.75%	1.75%
Additional net borrowing capacity under the line of credit	$69.80	$90.80	'	'	'	'	'	'
Note payable to financial institution balance outstanding	87.9	47.5	'	'	'	'	'	'
Weighted average borrowing rate	2.69%	2.31%	'	'	'	'	'	'
Note payable to financial institution	$165	'	'	'	'	'	'	'

LongTerm_Debt_Schedule_of_Long

Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Instrument [Line Items]	'	'
Total long-term debt	$6,357	$12,071
Current portion of long-term debt	5,714	5,714
Long-term debt, less current portion	643	6,357
Series A Term Note [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	2,143	4,286
Series B Term Note [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	1,500	3,000
Series C Term Note [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	1,429	2,857
Series D Term Note [Member]	'	'
Debt Instrument [Line Items]	'	'
Total long-term debt	$1,285	$1,928

LongTerm_Debt_Schedule_of_Long1

Long-Term Debt - Schedule of Long-Term Debt (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Series A Term Note [Member]	'
Debt Instrument [Line Items]	'
Annual term note payment	$2,100,000
Quarterly paid interest rate	10.50%
Maturity date	25-Feb-14
Series B Term Note [Member]	'
Debt Instrument [Line Items]	'
Annual term note payment	1,500,000
Quarterly paid interest rate	10.22%
Maturity date	21-Jun-14
Series C Term Note [Member]	'
Debt Instrument [Line Items]	'
Annual term note payment	1,400,000
Quarterly paid interest rate	9.11%
Maturity date	26-Oct-14
Series D Term Note [Member]	'
Debt Instrument [Line Items]	'
Annual term note payment	$643,000
Quarterly paid interest rate	9.07%
Maturity date	24-Jan-15

LongTerm_Debt_Future_Principal

Long-Term Debt - Future Principal Payments of Long-Term Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
2014	$5,714	'
2015	643	'
2016	'	'
2017	'	'
2018	'	'
Thereafter	'	'
Total long-term debt	$6,357	$12,071

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]	'	'	'
Interest expense under credit agreement and term notes	$4	$5.60	$9.30
Capitalized interest on term notes	$0.40	$0.20	$0.20

Leases_Schedule_of_Future_Mini

Leases - Schedule of Future Minimum Lease Payments for Capital Leases (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Leases [Abstract]	'	'
2014	$2,697	'
2015	2,697	'
2016	2,145	'
2017	1,315	'
2018	'	'
Thereafter	'	'
Total minimum lease payments	8,854	'
Amount representing interest	-958	'
Present value of minimum lease payments with average interest rates of 7.04%	7,895	'
Current portion of capital lease obligation	2,216	3,295
Capital lease obligation, less current portion	$5,679	$9,179

Leases_Schedule_of_Future_Mini1

Leases - Schedule of Future Minimum Lease Payments for Capital Leases (Parenthetical) (Detail)	Dec. 31, 2013
Leases [Abstract]	'
Weighted average interest rate on capital leases	7.04%

Leases_Additional_information_

Leases - Additional information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]	'	'	'
Capital lease obligations outstanding	$7.90	'	'
Weighted average interest rate on capital leases	7.04%	'	'
Capital leases outstanding under Bossier City Financing Arrangement	5.4	'	'
Rental expenses	$3.10	$3.20	$3.30
Maximum duration of operating leases (in years)	'10 years	'	'

Leases_Schedule_of_Future_Mini2

Leases - Schedule of Future Minimum Lease Payments for Operating Leases (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014	$2,733
2015	2,501
2016	2,225
2017	1,846
2018	688
Thereafter	753
Total	$10,746

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Assets	'	'
Escrow account	'	$898
Non - qualified retirement savings plan assets	6,000	5,280
Derivatives	1	'
Total Assets	6,001	6,178
Financial Liabilities	'	'
Contingent consideration	-4,425	'
Derivatives	-1	-353
Total Liabilities	-4,426	'
Level 1 [Member]	'	'
Financial Assets	'	'
Escrow account	'	898
Non - qualified retirement savings plan assets	4,944	5,280
Derivatives	'	'
Total Assets	4,944	6,178
Financial Liabilities	'	'
Contingent consideration	'	'
Derivatives	'	'
Total Liabilities	'	'
Level 2 [Member]	'	'
Financial Assets	'	'
Escrow account	'	'
Non - qualified retirement savings plan assets	1,056	'
Derivatives	1	'
Total Assets	1,057	'
Financial Liabilities	'	'
Contingent consideration	'	'
Derivatives	-1	-353
Total Liabilities	-1	'
Level 3 [Member]	'	'
Financial Assets	'	'
Escrow account	'	'
Non - qualified retirement savings plan assets	'	'
Derivatives	'	'
Total Assets	'	'
Financial Liabilities	'	'
Contingent consideration	-4,425	'
Derivatives	'	'
Total Liabilities	($4,425)	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Fair value discount rate	5.30%	'
Fair value of long-term debt	$6,300,000	$11,500,000
Carrying value of long-term debt	6,357,000	12,071,000
Non-recurring fair value measurement impairment charges	300,000	0
Permalok Corporation [Member] | Estimate of Fair Value Measurement [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Contingent consideration fair value estimate of liability	$4,400,000	'

Derivative_Financial_Instrumen1

Derivative Financial Instruments and Hedging Activities - Additional Information (Detail)

12 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2012

USD ($)

USD ($)

USD ($)

Designated As Hedging Instrument [Member]

Designated As Hedging Instrument [Member]

Designated As Hedging Instrument [Member]

Designated As Hedging Instrument [Member]

Designated As Hedging Instrument [Member]

Designated As Hedging Instrument [Member]

Not Designated As Hedging Instrument [Member]

Not Designated As Hedging Instrument [Member]

Not Designated As Hedging Instrument [Member]

Not Designated As Hedging Instrument [Member]

USD ($)

CAD

USD ($)

CAD

Other Contract [Member]

Other Contract [Member]

USD ($)

CAD

USD ($)

CAD

USD ($)

CAD

Derivatives, Fair Value [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional amount of derivative contracts

'

'

'

$3.80

4.1

$12.40

12.3

'

'

$0.10

0.1

$2.70

2.6

Maximum maturity period for Canadian forward contracts with maturity periods greater than 12 months

'

'

'

'13 months

'13 months

'

'

'

'

'

'

'

'

Maturity period for Canadian forward contracts

'12 months

'

'

'

'

'

'

'

'

'

'

'

'

Notional amount of Canadian forward contracts with maturity periods greater than 12 months

'

'

'

'

'

'

'

3.8

4

'

'

'

'

Gains (losses) from derivative contracts not designated as hedging instruments recognized in net sales

-0.1

-0.4

0.1

'

'

'

'

'

'

'

'

'

'

Unrealized pretax gain on outstanding derivatives accumulated in other comprehensive loss expected to be reclassified to net sales within next 12 months

$0.10

'

'

'

'

'

'

'

'

'

'

'

'

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	OptionPlan
	Investment_Options
Compensation And Retirement Disclosure [Abstract]	'	'	'
Defined contribution retirement plan, Company match on first 6% of employee contributions	50.00%	'	'
Defined contribution retirement plan, employee contributions for which Company will match at 50%	6.00%	'	'
Defined contribution retirement plan, number of investment options offered	25	'	'
Non-qualified retirement savings plan, Company match percentage on first $10,000 of employee contributions	50.00%	'	'
Non-qualified retirement savings plan, Officer contributions for which Company will match at 50%	$10,000	'	'
Non-qualified retirement savings plan, Select employee contributions for which Company will match at 50%	5,000	'	'
Non-qualified retirement savings plan target benefit amount	'35% of final base pay after a 35-year career with the Company or 1% of final base pay per year of service	'	'
Non-qualified retirement savings plan actuarial yearly asset growth percentage assumption	8.00%	'	'
Number of noncontributory defined benefit plans	2	'	'
Accrued pension liability	1,200,000	2,600,000	'
Unrecognized actuarial loss, net of tax	1,200,000	2,200,000	'
Projected and accumulated benefit obligation	5,800,000	6,700,000	'
Fair value of plan assets	4,600,000	4,100,000	'
Net periodic benefit cost	400,000	400,000	300,000
Weighted average discount rates used to measure projected benefit obligation	4.40%	3.52%	'
Expected weighted average long term rate of return on plan assets	7.50%	7.50%	'
Total expense for all retirement plans	$1,800,000	$1,700,000	$1,300,000

ShareBased_Compensation_Plans_1

Share-Based Compensation Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	OptionPlan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Number of inactive stock option plan	1	'	'
Number of active stock incentive plan	1	'	'
Maximum duration over which awards become exercisable under the plan	'60 months	'	'
Termination date of the option from date of grant, in years	'10 years	'	'
Number of common stock shares available for future issuance	720,301	227,177	307,984
Restricted stock units and performance stock awards granted and remain outstanding	'	'	'
Total intrinsic value of options exercised	$0.10	$0.10	$0.80
Number of options granted	0	0	0
RSUs and PSAs at target level of performance included in unvested balance	196,000	'	'
Minimum performance awards issued multiplier	0.00%	'	'
Maximum performance awards issued multiplier	200.00%	'	'
Directors [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Stock awards granted to non-employee directors	4,912	4,807	6,261
Grant date fair market value of stock awards	$27.49	$23.40	$25.15
Restricted Stock Units and Performance Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Maximum duration over which awards become exercisable under the plan	'3 years	'	'
Unrecognized compensation expense	3.9	'	'
Expected period of compensation expense recognized	'1 year 9 months 18 days	'	'
Restricted stock units and performance stock awards granted and remain outstanding	40,000	'	'
Restricted stock units and performance stock awards granted and remain outstanding	257,087	'	'
Fair value of RSUs and PSAs vested	$2.10	$0.60	$0.40
Performance Shares [Member] | Minimum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Maximum duration over which awards become exercisable under the plan	'2 years	'	'
Performance Shares [Member] | Maximum [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Maximum duration over which awards become exercisable under the plan	'3 years	'	'

ShareBased_Compensation_Plans_2

Share-Based Compensation Plans - Summary of Share-Based Compensation Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	$3,060	$3,048	$1,461
Cost of Sales [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	662	432	143
Selling, General and Administrative Expenses [Member]	'	'	'
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]	'	'	'
Share-based compensation expense	$2,398	$2,616	$1,318

ShareBased_Compensation_Plans_3

Share-Based Compensation Plans - Summary of Status of Company's Stock Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Options Outstanding, Beginning Balance	47,000	71,597	145,209
Options Outstanding, granted	'	'	'
Options Outstanding, exercised or exchanged	-7,000	-24,597	-73,612
Options Outstanding, cancelled	'	'	'
Options Outstanding, Ending Balance	40,000	47,000	71,597
Options, Weighted Average Exercise Price, Beginning Balance	$23.19	$21.26	$17.64
Exercisable and Outstanding, Options	40,000	'	'
Options Granted, Weighted Average Exercise Price	'	'	'
Options Exercised or Exchanged, Weighted Average Exercise Price	$10.31	$17.58	$14.12
Options Cancelled, Weighted Average Exercise Price	'	'	'
Options, Weighted Average Exercise Price, Ending Balance	$25.44	$23.19	$21.26
Exercisable and Outstanding, Weighted Average Exercise Price	$25.44	'	'
Exercisable and Outstanding, Weighted Average Remaining Contractual Life	'4 years 7 months 24 days	'	'
Exercisable and Outstanding, Aggregate Intrinsic Value	$493	'	'

ShareBased_Compensation_Plans_4

Share-Based Compensation Plans - Summary of Information about Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Options Outstanding, Number of Options	40,000	47,000	71,597	145,209
Options Outstanding, Weighted Average Remaining Contractual Life	'4 years 7 months 24 days	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$25.44	$23.19	$21.26	$17.64
Options Exercisable, Number of Options	40,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$25.44	'	'	'
Range One [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of Exercise Prices Per Share	$14	'	'	'
Options Outstanding, Number of Options	2,000	'	'	'
Options Outstanding, Weighted Average Remaining Contractual Life	'4 months 10 days	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$14	'	'	'
Options Exercisable, Number of Options	2,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$14	'	'	'
Range Two [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of Exercise Prices Per Share	$22.07	'	'	'
Options Outstanding, Number of Options	4,000	'	'	'
Options Outstanding, Weighted Average Remaining Contractual Life	'1 year 4 months 10 days	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$22.07	'	'	'
Options Exercisable, Number of Options	4,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$22.07	'	'	'
Range Three [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of Exercise Prices Per Share	$24.15	'	'	'
Options Outstanding, Number of Options	24,000	'	'	'
Options Outstanding, Weighted Average Remaining Contractual Life	'6 years 3 months	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$24.15	'	'	'
Options Exercisable, Number of Options	24,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$24.15	'	'	'
Range Four [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of Exercise Prices Per Share	$28.31	'	'	'
Options Outstanding, Number of Options	4,000	'	'	'
Options Outstanding, Weighted Average Remaining Contractual Life	'2 years 4 months 10 days	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$28.31	'	'	'
Options Exercisable, Number of Options	4,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$28.31	'	'	'
Range Five [Member]	'	'	'	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'	'	'	'
Range of Exercise Prices Per Share	$34.77	'	'	'
Options Outstanding, Number of Options	6,000	'	'	'
Options Outstanding, Weighted Average Remaining Contractual Life	'3 years 4 months 28 days	'	'	'
Options Outstanding, Weighted Average Exercise Price Per Share	$34.77	'	'	'
Options Exercisable, Number of Options	6,000	'	'	'
Options Exercisable, Weighted Average Exercise Price Per Share	$34.77	'	'	'

ShareBased_Compensation_Plans_5

Share-Based Compensation Plans - Summary of Status of Company's RSUs and PSAs (Detail) (Restricted Stock Units and Performance Stock Awards [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restricted Stock Units and Performance Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Unvested RSUs and PSAs, Beginning Balance	243,141	193,981	55,843
RSUs and PSAs granted	117,966	115,306	174,891
Unvested RSUs and PSAs cancelled	-16,002	-39,306	-20,997
RSUs and PSAs vested	-88,018	-26,840	-15,756
Unvested RSUs and PSAs, Ending Balance	257,087	243,141	193,981
Unvested RSUs and PSAs, Weighted Average Grant Date Fair Value, Beginning Balance	$26.11	$24.41	$37
RSUs and PSAs granted, Weighted Average Grant Date Fair Value	$34.24	$29.06	$23.32
Unvested RSUs and PSAs cancelled, Weighted Average Grant Date Fair Value	$27.45	$28.44	$47.46
RSUs and PSAs vested, Weighted Average Grant Date Fair Value	$23.37	$23.13	$26.27
Unvested RSUs and PSAs, Weighted Average Grant Date Fair Value, Ending Balance	$30.69	$26.11	$24.41

Shareholder_Rights_Plan_Additi

Shareholder Rights Plan - Additional Information (Detail) (USD $)	0 Months Ended
	Jun. 18, 2009	Dec. 31, 2013
		Right
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'
Number of series A junior participating preferred stock shares reserved	'	150,000
Number of non-detachable preferred stock purchase right distributed as dividend to shareholders	'	1
Right to purchase a share of Preferred Stock per each right	'	0.01
Price at which shareholders holding a right may purchase 1/100th of a share of preferred stock	'	$83
Acquisition percentage to cause rights to become exercisable	'	15.00%
Market value, multiple over exercise price	'	2
Value at which Company may redeem rights	'	$0.01
Rights agreement expiration date	28-Jun-19	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	1 Months Ended			12 Months Ended
	Jun. 30, 2007	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
		Parties	Portland Harbor Natural Resources Trustee Council [Member]	Minimum [Member]	Maximum [Member]
Other Commitments [Line Items]	'	'	'	'	'
Company made payment to Lower Willamette Group as interim settlement	$175,000	'	'	'	'
Liability to pay	0	'	0	'	'
Estimated cost	'	'	'	169,000,000	1,760,000,000
Estimated years to implement	'	'	'	'2 years	'28 years
Amount spent for Source Control work	'	100,000	'	'	'
Amount anticipated to spent for further Source Control work	'	100,000	'	'	'
Cost of remedy expected to be allocated among potentially responsible parties	'	100	'	'	'
Total stand-by letters of credit	'	$3,100,000	'	'	'

Income_Taxes_Schedule_of_Compo

Income Taxes - Schedule of Components of Provision for Income Taxes (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:	'	'	'
Federal	$5,737	$5,428	$2,639
State	566	130	695
Total current tax expense	6,303	5,558	3,334
Deferred:	'	'	'
Federal	-7,319	-296	5,380
State	-1,110	259	904
Total deferred tax expense	-8,429	-37	6,284
Total	($2,126)	$5,521	$9,618

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal statutory rate	35.00%	'	'
State net operating loss carryforwards	$13,000,000	'	'
Net operating loss carryforwards expiration date, lower limit	'2018	'	'
State tax carryforwards	889,000	'	'
Net operating loss carryforwards expiration date, upper limit	'2031	'	'
Tax carryforwards, expiration year	'2014	'	'
Deferred tax liability	650,000	'	'
Undistributed foreign earnings	1,900,000	'	'
Unrecognized tax benefits	2,100,000	'	'
Accrued interest related to uncertain tax positions	268,000	172,000	'
Interest for uncertain tax positions	$96,000	$100,000	$8,000

Income_Taxes_Schedule_of_Effec

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Effective Income Tax Rate Reconciliation	'	'	'
Provision (benefit) at statutory rate of 35%	($1,067)	$7,618	$7,800
State provision, net of federal benefit	-393	519	922
Research and development credits	-916	-1,734	'
Domestic manufacturing deduction	-641	-762	-389
Sale of business	'	'	341
Change in valuation allowance	954	'	872
Uncertain tax positions	-311	-67	126
Nondeductible expenses	370	278	190
Other	-122	-331	-244
Total	($2,126)	$5,521	$9,618
Effective tax (benefit) rate	-69.70%	25.40%	43.20%

Income_Taxes_Schedule_of_Curre

Income Taxes - Schedule of Current and Noncurrent Deferred Tax Assets and Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current deferred tax assets:	'	'
Costs and estimated earnings in excess of billings on uncompleted contracts, net	$2,384	$1,323
Accrued employee benefits	951	1,612
Inventories	2,671	1,393
Trade receivable, net	319	650
Net operating loss carryforwards	500	364
Other	520	693
Total	7,345	6,035
Valuation allowance	-500	-146
Deferred income taxes	6,845	5,889
Current deferred tax liabilities:	'	'
Prepaid expenses	-637	-712
Current deferred tax assets, net	6,208	5,177
Noncurrent deferred tax assets:	'	'
Net operating loss carryforwards	211	549
Tax credit carryforwards	478	64
Accrued employee benefits	3,740	3,673
Other assets	5,520	4,527
Other	138	17
Total	10,087	8,830
Valuation allowance	-1,394	-794
Deferred tax assets, net of valuation allowance noncurrent	8,693	8,036
Noncurrent deferred tax liabilities:	'	'
Property and equipment	-19,343	-23,290
Intangible assets	-1,192	'
Noncurrent deferred tax liabilities, net	-11,842	-15,254
Net deferred tax liabilities	($5,634)	($10,077)

Income_Taxes_Schedule_of_Unrec

Income Taxes - Schedule of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Unrecognized tax benefits, beginning balance	$5,245	$309	$125
Increases for positions taken in prior years	646	3,571	10
Decreases for positions taken in prior years	-696	-184	'
Increases for positions taken in the current year	1,012	1,549	174
Unrecognized tax benefits, ending balance	$6,207	$5,245	$309

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'	'
Pension liability adjustment, net of tax benefit of $704 and $1,244	($1,275)	($2,188)	'
Deferred gain (loss) on cash flow derivatives, net of tax expense of $9 and benefit of $50	14	-85	'
Total	($1,261)	($2,273)	($2,312)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement Of Income And Comprehensive Income [Abstract]	'	'
Pension liability adjustment, tax effect	$704	$1,244
Net deferred gain (loss) on cash flow derivatives, tax effect	$9	$50

Accumulated_Other_Comprehensiv4

Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), Beginning Balance	($2,273)	($2,312)	'
Other comprehensive income (loss) before reclassifications	803	-295	'
Amounts reclassified from accumulated other comprehensive income (loss)	209	334	'
Other comprehensive income (loss)	1,012	39	-456
Accumulated other comprehensive income (loss), Ending Balance	-1,261	-2,273	-2,312
Defined Benefit Pension Items [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), Beginning Balance	-2,188	-2,326	'
Other comprehensive income (loss) before reclassifications	674	-175	'
Amounts reclassified from accumulated other comprehensive income (loss)	239	313	'
Other comprehensive income (loss)	913	138	'
Accumulated other comprehensive income (loss), Ending Balance	-1,275	-2,188	'
Gains (Losses) on Cash Flow Hedges [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), Beginning Balance	-85	14	'
Other comprehensive income (loss) before reclassifications	171	-120	'
Amounts reclassified from accumulated other comprehensive income (loss)	-72	21	'
Other comprehensive income (loss)	99	-99	'
Accumulated other comprehensive income (loss), Ending Balance	$14	($85)	'

Accumulated_Other_Comprehensiv5

Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Accumulated Other Comprehensive Income (Loss) (Detail) (Amount reclassified from Accumulated Other Comprehensive Income (Loss) [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Total reclassifications for the period recognized in Net income (loss)	($209)	($334)	($494)
Defined Benefit Pension Items [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Cost of Sales	-372	-417	-266
Tax (expense) benefit	133	104	90
Total reclassifications for the period recognized in Net income (loss)	-239	-313	-176
Gains (Losses) on Cash Flow Hedges [Member]	'	'	'
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]	'	'	'
Net Sales	114	-40	-501
Tax (expense) benefit	-42	19	183
Total reclassifications for the period recognized in Net income (loss)	$72	($21)	($318)

Segment_Information_Additional

Segment Information - Additional Information (Detail) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	ManufacturingSites
Segment Reporting [Abstract]	'	'	'
Manufacturing locations, Water Transmission	8	'	'
Threshold for disclosure, sales represented by individual customer	'	'	10.00%
Percent of total net sales for single customer	12.00%	12.00%	'
Property and equipment, net, located in Mexico	$2.20	$2.40	'

Segment_Information_Segment_In

Segment Information - Segment Information Report of Statements of Operations (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	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

Segment_Information_Segment_In1

Segment Information - Segment Information Report of Balance Sheets (Detail) (USD $)

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 30, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

In Thousands, unless otherwise specified

Operating Segments [Member]

Operating Segments [Member]

Corporate [Member]

Corporate [Member]

Water Transmission [Member]

Water Transmission [Member]

Water Transmission [Member]

Tubular Products [Member]

Tubular Products [Member]

Tubular Products [Member]

Tubular Products [Member]

Operating Segments [Member]

Operating Segments [Member]

Operating Segments [Member]

Operating Segments [Member]

Operating Segments [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

'

Quarterly_Data_Summary_of_Quar

Quarterly Data - Summary of Quarterly Financial Data (Detail) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	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	$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

Quarterly_Data_Additional_Info

Quarterly Data - Additional Information (Detail) (Tubular Products [Member], USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013
Tubular Products [Member]	'
Quarterly Financial Data [Line Items]	'
Fixed asset impairment charge	$27.50

Schedule_II_Valuation_and_Qual1

Schedule II - Valuation and Qualifying Accounts (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	$1,748	$1,650	$2,151
Charged to Profit and Loss	124	1,381	3,518
Deduction from Reserves	-1,187	-1,283	-4,019
Balance at End of Period	685	1,748	1,650
Valuation Allowance of Deferred Tax Assets [Member]	'	'	'
Valuation and Qualifying Accounts Disclosure [Line Items]	'	'	'
Balance at Beginning of Period	940	926	105
Charged to Profit and Loss	954	14	872
Deduction from Reserves	'	'	-51
Balance at End of Period	$1,894	$940	$926