Intangible Assets and Estimated Useful Lives (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	$ 624,050	$ 656,967
Amortized intangible assets, accumulated amortization	(403,854)	(411,812)
Unamortized intangible assets, gross carrying amount	357
Developed Software and Core Technologies
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	336,262	321,076
Amortized intangible assets, accumulated amortization	(251,201)	(227,298)
Customer Lists and Contract Backlog
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	159,885	221,159
Amortized intangible assets, accumulated amortization	(76,160)	(121,380)
Trade Names
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	127,903	114,432
Amortized intangible assets, accumulated amortization	(76,493)	(63,082)
Non-Compete Agreements
Intangible Assets [Line Items]
Amortized intangible assets, gross carrying amount	0	300
Amortized intangible assets, accumulated amortization	0	(52)
Trade Names
Intangible Assets [Line Items]
Unamortized intangible assets, gross carrying amount	$ 357	$ 14,157