Identified Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Identified intangible assets [Line items]
Fair Value	$ 121,100
Weighted- Average Life	4 years 10 months 24 days
In-process research and development	51,300
Total identified intangible assets	172,400
Current technology [Member]
Identified intangible assets [Line items]
Fair Value	73,400
Weighted- Average Life	4 years
Customer relationships [Member]
Identified intangible assets [Line items]
Fair Value	41,700
Weighted- Average Life	7 years
Order backlog [Member]
Identified intangible assets [Line items]
Fair Value	4,500
Weighted- Average Life	6 months
Trade names [Member]
Identified intangible assets [Line items]
Fair Value	$ 1,500
Weighted- Average Life	3 years