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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,285us-gaap_NetIncomeLoss $ 3,649us-gaap_NetIncomeLoss
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:    
Deferred income taxes (206)us-gaap_DeferredIncomeTaxExpenseBenefit (195)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization 4,776us-gaap_DepreciationAmortizationAndAccretionNet 2,902us-gaap_DepreciationAmortizationAndAccretionNet
Equity in income of nonconsolidated investment (173)us-gaap_IncomeLossFromEquityMethodInvestments (204)us-gaap_IncomeLossFromEquityMethodInvestments
Loss (gain) on sales and disposals of property, plant and equipment 0us-gaap_GainLossOnSaleOfPropertyPlantEquipment 12us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Share-based compensation 620us-gaap_ShareBasedCompensation 575us-gaap_ShareBasedCompensation
Excess tax benefit from share-based compensation (310)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (85)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Change in operating assets and liabilities, net of acquisitions:    
Accounts receivable 16,044us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables 31,574us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Inventories (8,276)us-gaap_IncreaseDecreaseInInventories (833)us-gaap_IncreaseDecreaseInInventories
Other current assets (1,059)us-gaap_IncreaseDecreaseInOtherCurrentAssets (1,755)us-gaap_IncreaseDecreaseInOtherCurrentAssets
Prepaid income tax (745)us-gaap_IncreaseDecreaseInPrepaidExpense 450us-gaap_IncreaseDecreaseInPrepaidExpense
Other noncurrent assets (1,429)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets 43us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Dividends from LB Pipe & Coupling Products, LLC 90us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital 90us-gaap_ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital
Accounts payable (12,478)us-gaap_IncreaseDecreaseInAccountsPayable (2,568)us-gaap_IncreaseDecreaseInAccountsPayable
Deferred revenue (1,083)us-gaap_IncreaseDecreaseInDeferredRevenue 1,401us-gaap_IncreaseDecreaseInDeferredRevenue
Accrued payroll and employee benefits (5,540)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities (3,135)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Other current liabilities (1,928)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities (330)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Other liabilities (17)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 595us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash (used) provided by operating activities (7,429)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 32,186us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES    
Proceeds from the sale of property, plant and equipment 4us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 184us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Capital expenditures on property, plant and equipment (4,466)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,499)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions, net of cash acquired (189,200)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (495)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash used by investing activities (193,662)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,810)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:    
Repayments of long-term debt (28,084)us-gaap_RepaymentsOfOtherLongTermDebt (19)us-gaap_RepaymentsOfOtherLongTermDebt
Proceeds from long-term debt 219,891us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt 316us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt
Proceeds from exercise of stock options and stock awards 68us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 0us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Financing fees (1,670)us-gaap_PaymentsOfFinancingCosts 0us-gaap_PaymentsOfFinancingCosts
Treasury stock acquisitions (962)us-gaap_PaymentsForRepurchaseOfCommonStock (747)us-gaap_PaymentsForRepurchaseOfCommonStock
Cash dividends on common stock paid to shareholders (416)us-gaap_PaymentsOfDividendsCommonStock (309)us-gaap_PaymentsOfDividendsCommonStock
Excess income tax benefit from share-based compensation 310us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 85us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash provided (used) by financing activities 189,137us-gaap_NetCashProvidedByUsedInFinancingActivities (674)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (2,520)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (1,194)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net (decrease) increase in cash and cash equivalents (14,474)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 26,508us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 52,024us-gaap_CashAndCashEquivalentsAtCarryingValue 64,623us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 37,550us-gaap_CashAndCashEquivalentsAtCarryingValue 91,131us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure of Cash Flow Information:    
Interest paid 288us-gaap_InterestPaid 87us-gaap_InterestPaid
Income taxes paid $ 3,551us-gaap_IncomeTaxesPaid $ 1,480us-gaap_IncomeTaxesPaid