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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Cash Flows [Abstract]    
Proceeds from Noncontrolling Interests $ 7,802us-gaap_ProceedsFromMinorityShareholders $ 0us-gaap_ProceedsFromMinorityShareholders
Operating activities:    
Net income (loss) (13,118)us-gaap_ProfitLoss 28,655us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 17,332us-gaap_DepreciationDepletionAndAmortization 12,945us-gaap_DepreciationDepletionAndAmortization
Deferred income tax (1,026)us-gaap_DeferredIncomeTaxExpenseBenefit (4,501)us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on sale of property, plant and equipment (305)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (39)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Provision for uncollectible accounts 419us-gaap_ProvisionForDoubtfulAccounts (81)us-gaap_ProvisionForDoubtfulAccounts
Stock-based compensation expense 4,730us-gaap_ShareBasedCompensation 3,905us-gaap_ShareBasedCompensation
Excess Tax Benefit from Share-based Compensation, Operating Activities (1,764)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (1,597)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Other 178us-gaap_OtherNoncashIncomeExpense 150us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities increasing (decreasing) cash, net of effects from acquisitions:    
Accounts receivable 17,353us-gaap_IncreaseDecreaseInAccountsReceivable (58,955)us-gaap_IncreaseDecreaseInAccountsReceivable
Costs and estimated earnings in excess of billings on uncompleted contracts (4,332)us-gaap_IncreaseDecreaseInCostInExcessOfBillingOnUncompletedContract (10,901)us-gaap_IncreaseDecreaseInCostInExcessOfBillingOnUncompletedContract
Inventories 170us-gaap_IncreaseDecreaseInInventories (109)us-gaap_IncreaseDecreaseInInventories
Other assets and liabilities 2,425us-gaap_IncreaseDecreaseInOtherOperatingAssets 7,335us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable (23,025)us-gaap_IncreaseDecreaseInAccountsPayable 38,734us-gaap_IncreaseDecreaseInAccountsPayable
Billings on uncompleted contracts in excess of costs and estimated earnings 31,006us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings (4,684)us-gaap_IncreaseDecreaseInBillingInExcessOfCostOfEarnings
Accrued expenses 6,932us-gaap_IncreaseDecreaseInAccruedLiabilities 9,298us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 36,975us-gaap_NetCashProvidedByUsedInOperatingActivities 20,155us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Acquisition of property, plant and equipment (11,075)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (17,834)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisition, net of cash acquired (5,551)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (51,398)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from asset sales 653us-gaap_ProceedsFromSaleOfProductiveAssets 327us-gaap_ProceedsFromSaleOfProductiveAssets
Net cash used by investing activities (15,973)us-gaap_NetCashProvidedByUsedInInvestingActivities (68,905)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Issuances of common stock 493us-gaap_ProceedsFromIssuanceOfCommonStock 1,076us-gaap_ProceedsFromIssuanceOfCommonStock
Excess tax benefit of exercised stock options and vesting of deferred shares 1,764us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 1,597us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payments of Debt Issuance Costs 0us-gaap_PaymentsOfDebtIssuanceCosts (507)us-gaap_PaymentsOfDebtIssuanceCosts
Advances under credit agreement 8,289us-gaap_ProceedsFromLongTermLinesOfCredit 68,970us-gaap_ProceedsFromLongTermLinesOfCredit
Repayments of advances under credit agreement (9,976)us-gaap_RepaymentsOfLongTermLinesOfCredit (23,867)us-gaap_RepaymentsOfLongTermLinesOfCredit
Proceeds from issuance of common stock under employee stock purchase plan 215us-gaap_ProceedsFromStockPlans 76us-gaap_ProceedsFromStockPlans
Repurchase of common stock for payment of statutory taxes due on equity-based compensation (2,472)us-gaap_PaymentsForRepurchaseOfOtherEquity (1,678)us-gaap_PaymentsForRepurchaseOfOtherEquity
Net cash provided (used) by financing activities 6,115us-gaap_NetCashProvidedByUsedInFinancingActivities 45,667us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash (1,049)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (909)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents 26,068us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,992)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 77,115us-gaap_CashAndCashEquivalentsAtCarryingValue 63,750us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 103,183us-gaap_CashAndCashEquivalentsAtCarryingValue 59,758us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:    
Income taxes 6,700us-gaap_IncomeTaxesPaidNet 11,445us-gaap_IncomeTaxesPaidNet
Interest 1,019us-gaap_InterestPaid 579us-gaap_InterestPaid
Non-cash investing and financing activities:    
Purchases of property, plant and equipment on account $ 1,104us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 965us-gaap_CapitalExpendituresIncurredButNotYetPaid