Goodwill and Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Goodwill And Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,005,363	$ 1,001,374
Accumulated Amortization	(696,434)	(650,012)
Intangible Assets, Net	308,929	351,362
Registered trademarks	52,000	52,000
Goodwill	1,222,823	1,200,746
Total	1,274,823	1,252,746
Proprietary Technology [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Gross Carrying Amount	450,964	451,087
Accumulated Amortization	(294,658)	(267,547)
Intangible Assets, Net	156,306	183,540
Customer Contracts and Relationships [Member]
Schedule Of Goodwill And Intangible Assets [Line Items]
Gross Carrying Amount	554,399	550,287
Accumulated Amortization	(401,776)	(382,465)
Intangible Assets, Net	$ 152,623	$ 167,822