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Supplementary Financial Information (unaudited) (Detail 2)
 3 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Supplementary Financial Information (unaudited)                
Total revenues (as a percent) 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage 100.00%itg_RevenuesPercentage
Expenses (as a percent)                
Compensation and employee benefits (as a percent) 39.90%itg_LaborAndRelatedExpensePercentage 38.90%itg_LaborAndRelatedExpensePercentage 38.10%itg_LaborAndRelatedExpensePercentage 37.20%itg_LaborAndRelatedExpensePercentage 38.50%itg_LaborAndRelatedExpensePercentage 38.90%itg_LaborAndRelatedExpensePercentage 36.80%itg_LaborAndRelatedExpensePercentage 37.50%itg_LaborAndRelatedExpensePercentage
Transaction processing (as a percent) 16.30%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 16.00%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 14.50%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 14.90%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 15.10%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 15.50%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 16.20%itg_FloorBrokerageExchangeAndClearanceFeesPercentage 16.30%itg_FloorBrokerageExchangeAndClearanceFeesPercentage
Occupancy and equipment (as a percent) 9.90%itg_OccupancyNetPercentage 11.10%itg_OccupancyNetPercentage 10.80%itg_OccupancyNetPercentage 11.00%itg_OccupancyNetPercentage 12.10%itg_OccupancyNetPercentage 12.40%itg_OccupancyNetPercentage 14.90%itg_OccupancyNetPercentage 12.50%itg_OccupancyNetPercentage
Telecommunications and data processing services (as a percent) 8.70%itg_CommunicationsAndInformationTechnologyPercentage 9.60%itg_CommunicationsAndInformationTechnologyPercentage 9.10%itg_CommunicationsAndInformationTechnologyPercentage 9.20%itg_CommunicationsAndInformationTechnologyPercentage 10.00%itg_CommunicationsAndInformationTechnologyPercentage 9.90%itg_CommunicationsAndInformationTechnologyPercentage 9.80%itg_CommunicationsAndInformationTechnologyPercentage 10.70%itg_CommunicationsAndInformationTechnologyPercentage
Other general and administrative (as a percent) 12.90%itg_OtherGeneralAndAdministrativeExpensePercentage 15.00%itg_OtherGeneralAndAdministrativeExpensePercentage 15.00%itg_OtherGeneralAndAdministrativeExpensePercentage 13.90%itg_OtherGeneralAndAdministrativeExpensePercentage 15.60%itg_OtherGeneralAndAdministrativeExpensePercentage 14.40%itg_OtherGeneralAndAdministrativeExpensePercentage 14.20%itg_OtherGeneralAndAdministrativeExpensePercentage 14.20%itg_OtherGeneralAndAdministrativeExpensePercentage
Restructuring charges (as a percent)             (0.10%)itg_RestructuringChargesPercentage  
Interest expense (as a percent) 0.40%itg_InterestExpensePercentage 0.40%itg_InterestExpensePercentage 0.40%itg_InterestExpensePercentage 0.40%itg_InterestExpensePercentage 0.60%itg_InterestExpensePercentage 0.50%itg_InterestExpensePercentage 0.50%itg_InterestExpensePercentage 0.50%itg_InterestExpensePercentage
Total expenses (as a percent) 88.10%itg_CostsAndExpensesPercentage 91.00%itg_CostsAndExpensesPercentage 87.90%itg_CostsAndExpensesPercentage 86.60%itg_CostsAndExpensesPercentage 91.90%itg_CostsAndExpensesPercentage 91.60%itg_CostsAndExpensesPercentage 92.30%itg_CostsAndExpensesPercentage 91.70%itg_CostsAndExpensesPercentage
Income (loss) before income tax expense (as a percent) 11.90%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 9.00%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 12.10%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 13.40%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 8.10%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 8.40%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 7.70%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage 8.30%itg_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsPercentage
Income tax expense (benefit) (as a percent) 3.20%itg_IncomeTaxExpenseBenefitPercentage 0.50%itg_IncomeTaxExpenseBenefitPercentage 2.70%itg_IncomeTaxExpenseBenefitPercentage 3.50%itg_IncomeTaxExpenseBenefitPercentage 0.70%itg_IncomeTaxExpenseBenefitPercentage 2.30%itg_IncomeTaxExpenseBenefitPercentage 4.10%itg_IncomeTaxExpenseBenefitPercentage 1.80%itg_IncomeTaxExpenseBenefitPercentage
Net income (loss) (as a percent) 8.70%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 8.50%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 9.40%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 9.90%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 7.30%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 6.00%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 3.70%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage 6.50%itg_NetIncomeLossAvailableToCommonStockholdersBasicPercentage