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Long-Term Incentive Employee Compensation - Summary of Stock Options by Exercise Price (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 1.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2.7us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 4.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 8.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 6 years 8 months 12 days      
Options Outstanding Weighted-Average Exercise Price $ 24.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 20.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 18.46us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 16.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options Outstanding Aggregate Intrinsic Value $ 31.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Options Exercisable Number 1.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 1.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber 2.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber  
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 5 years 9 months 18 days      
Options Exercisable Weighted-Average Exercise Price $ 20.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 18.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice $ 17.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice  
Options Exercisable Aggregate Intrinsic Value 22.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1      
$12.39 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesOneMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 1 year 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 2.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesOneMember		      
Options Exercisable Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesOneMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 1 year 2 months 12 days      
Options Exercisable Aggregate Intrinsic Value 2.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesOneMember		      
$19.82 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesTwoMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 1.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesTwoMember		      
Options Exercisable Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesTwoMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 2 months 12 days      
Options Exercisable Aggregate Intrinsic Value 1.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesTwoMember		      
$19.97 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesThreeMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 5 years 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 3.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesThreeMember		      
Options Exercisable Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesThreeMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 5 years 2 months 12 days      
Options Exercisable Aggregate Intrinsic Value 3.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePricesThreeMember		      
$20.28 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFourMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 6 years 10 months 24 days      
Options Outstanding Aggregate Intrinsic Value 9.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFourMember		      
Options Exercisable Number 0.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFourMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 6 years 10 months 24 days      
Options Exercisable Aggregate Intrinsic Value 9.5us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFourMember		      
$21.53 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSixMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 7 years 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 5.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSixMember		      
Options Exercisable Number 0.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSixMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 7 years 2 months 12 days      
Options Exercisable Aggregate Intrinsic Value 1.0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSixMember		      
$22.80 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFiveMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 6 years 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 4.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFiveMember		      
Options Exercisable Number 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFiveMember		      
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) 6 years 2 months 12 days      
Options Exercisable Aggregate Intrinsic Value 4.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeOfExercisePriceFiveMember		      
$26.76 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSevenMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 8 years 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value 4.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesSevenMember		      
$43.52 Exercise Price        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]        
Options Outstanding Number 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesEightMember		      
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) 9 years 2 months 12 days      
Options Outstanding Aggregate Intrinsic Value $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= itt_RangeofExercisePricesEightMember