Schedule of Gross Carrying Amount and Accumulated Amortization of Identifiable Intangible Assets Other Than Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Identifiable Intangible Assets [Line Items]
Total other intangible assets, Gross Carrying Amount	$ 460,904	$ 458,523
Amortized intangible assets, Accumulated Amortization	(124,457)	(109,639)
Customer Lists and Relationships
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	170,971	172,724
Amortized intangible assets, Accumulated Amortization	(43,426)	(36,028)
Acquired Technology
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	98,262	99,383
Amortized intangible assets, Accumulated Amortization	(58,147)	(56,879)
Trademarks
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	56,733	53,510
Amortized intangible assets, Accumulated Amortization	(12,335)	(10,591)
Unamortized intangible assets, Gross Carrying Amount	123,415	123,735
Unamortized intangible assets, Accumulated Amortization
Other Intangible Assets
Identifiable Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	11,523	9,171
Amortized intangible assets, Accumulated Amortization	$ (10,549)	$ (6,141)