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Earnings Per Share - Number of Shares Underlying Stock Options Excluded from Computation of Diluted Loss (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive stock options 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2.0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Average exercise price $ 43.51itt_AverageExercisePriceOfAntiDilutiveStockOptions $ 26.83itt_AverageExercisePriceOfAntiDilutiveStockOptions $ 21.47itt_AverageExercisePriceOfAntiDilutiveStockOptions
Performance Shares [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive stock options 0.1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_PerformanceSharesMember		    
Minimum [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Year(s) of expiration 2024 2023 2014
Maximum [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Year(s) of expiration 2024 2023 2022