Identifiable Intangible Assets, LogLogic (Detail) (LogLogic, Inc, USD $) In Thousands, unless otherwise specified	1 Months Ended
	Apr. 10, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 61,200
Weighted average amortization period	6 years 1 month 6 days
Existing Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	32,800
Weighted average amortization period	6 years
Customer Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	3,200
Weighted average amortization period	7 years
Maintenance Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	22,300
Weighted average amortization period	6 years
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets	$ 2,900
Weighted average amortization period	7 years