Intangible Assets and Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 688,289	$ 640,317
Amortized intangible assets, Accumulated Amortization	(404,241)	(373,594)
Noncompete Agreements [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	300	0
Amortized intangible assets, Accumulated Amortization	(14)	0
Trade Names [Member]
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	114,888	102,651
Amortized intangible assets, Accumulated Amortization	(57,074)	(50,990)
Developed software and core technologies
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	323,886	300,493
Amortized intangible assets, Accumulated Amortization	(216,021)	(203,236)
Customer lists and contract backlog
Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	249,215	237,173
Amortized intangible assets, Accumulated Amortization	(131,132)	(119,368)
Trade Names [Member]
Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 14,157	$ 24,667