Debt - Additional Information (Detail)	Nov. 25, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Commercial Paper		$ 94,500,000	$ 0
Revolving Credit Facility, Amount Outstanding		$ 150,000,000
ITT 2014 Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Extension period of revolving credit facility	1 year
Revolving credit facility	$ 500,000,000
Maximum face amount outstanding on letters of credit	100,000,000
Minimum amount of reduce commitments	10,000,000
Maximum potential increase in credit facility	200,000,000
Maximum potential credit facility outstanding	$ 700,000,000
Maximum Leverage Ratio Under Credit Facility	3.00
Minimum leverage ratio under credit facility	1.00
Maximum interest coverage ratio under credit facility	3.00
Minimum interest coverage ratio under credit facility	1.00
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate		1.04%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Short-term Debt, Weighted Average Interest Rate		1.55%