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Summary of Other Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
May 31, 2014
Schedule of Accrued Liabilities [Line Items]    
Payroll and other compensation expenses $ 30,260us-gaap_EmployeeRelatedLiabilitiesCurrent $ 28,737us-gaap_EmployeeRelatedLiabilitiesCurrent
Insurance accruals 6,610us-gaap_AccruedInsuranceCurrent 5,897us-gaap_AccruedInsuranceCurrent
Property, sales and other non-income related taxes 2,819us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 2,381us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Lease commitments 1,836us-gaap_AccruedRentCurrent 1,881us-gaap_AccruedRentCurrent
Deferred revenue 2,180us-gaap_DeferredRevenue 1,198us-gaap_DeferredRevenue
Other 8,137tisi_OtherMiscellaneousAccruedLiabilities 8,297tisi_OtherMiscellaneousAccruedLiabilities
Total $ 51,842us-gaap_OtherAccruedLiabilitiesCurrent $ 48,391us-gaap_OtherAccruedLiabilitiesCurrent