Estimated Useful Lives (Detail)	9 Months Ended
	Sep. 30, 2016
Minimum [Member] | Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	3 years
Minimum [Member] | Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years
Minimum [Member] | Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Maximum [Member] | Developed Software and Core Technologies
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	11 years
Maximum [Member] | Customer Lists and Contract Backlog
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years
Maximum [Member] | Trade Names
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years