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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Cash flows from operating activities:    
Net income $ 24,613us-gaap_ProfitLoss $ 19,074us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Earnings from unconsolidated affiliates   (793)us-gaap_IncomeLossFromEquityMethodInvestments
Depreciation and amortization 11,164us-gaap_DepreciationDepletionAndAmortization 10,691us-gaap_DepreciationDepletionAndAmortization
Amortization of deferred loan costs 112us-gaap_AmortizationOfFinancingCosts 110us-gaap_AmortizationOfFinancingCosts
Foreign currency loss 816us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 530us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Deferred income taxes (1,052)us-gaap_DeferredIncomeTaxExpenseBenefit 3,438us-gaap_DeferredIncomeTaxExpenseBenefit
Gain on contingent consideration revaluation   (2,138)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Loss (gain) on asset sales 103us-gaap_GainLossOnDispositionOfAssets1 (85)us-gaap_GainLossOnDispositionOfAssets1
Non-cash compensation cost 2,465us-gaap_ShareBasedCompensation 2,210us-gaap_ShareBasedCompensation
(Increase) decrease:    
Receivables (41,509)us-gaap_IncreaseDecreaseInAccountsReceivable (12,150)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory (1,253)us-gaap_IncreaseDecreaseInInventories (83)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets (737)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 1,457us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Increase (decrease):    
Accounts payable 6,358us-gaap_IncreaseDecreaseInAccountsPayable (507)us-gaap_IncreaseDecreaseInAccountsPayable
Other accrued liabilities 4,687us-gaap_IncreaseDecreaseInOtherAccruedLiabilities (3,459)us-gaap_IncreaseDecreaseInOtherAccruedLiabilities
Income taxes 3,371us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 2,923us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Net cash provided by operating activities 9,138us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 21,218us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:    
Capital expenditures (11,425)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (13,619)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Business acquisitions, net of cash acquired (2,949)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (10,175)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Proceeds from sale of assets 35us-gaap_ProceedsFromSaleOfProductiveAssets 204us-gaap_ProceedsFromSaleOfProductiveAssets
Decrease in other assets, net 288us-gaap_PaymentsForProceedsFromOtherInvestingActivities 3us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (14,051)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (23,587)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:    
Net borrowings under revolving credit agreement 13,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit 18,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
Deferred consideration payments (1,000)tisi_PaymentOfDeferredConsideration (1,000)tisi_PaymentOfDeferredConsideration
Corporate tax effect from share-based payment arrangements 1,499us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 679us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Issuance of common stock from share-based payment arrangements 1,290us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions 1,987us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions
Payments related to withholding tax for share-based payment arrangements (1,735)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (1,692)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Payments related to purchase of treasury stock   (13,334)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash provided by financing activities 13,054us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 4,640us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash (1,776)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 159us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase in cash and cash equivalents 6,365us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,430us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 34,656us-gaap_CashAndCashEquivalentsAtCarryingValue 34,201us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 41,021us-gaap_CashAndCashEquivalentsAtCarryingValue $ 36,631us-gaap_CashAndCashEquivalentsAtCarryingValue