Allocation of Purchase Price (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Onpath
Allocation of the purchase consideration:
Current assets	$ 8,389
Fixed assets	778
Identifiable intangible assets	10,970
Goodwill	20,869
Deferred tax asset	6,330
Other assets	1,432
Total assets acquired	48,768
Current liabilities	(6,387)
Deferred revenue	(921)
Deferred income tax liabilities	(4,660)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	36,800
Accanto Systems Srl
Allocation of the purchase consideration:
Current assets	389
Fixed assets	237
Identifiable intangible assets	5,280
Goodwill	11,157
Total assets acquired	17,063
Current liabilities	(839)
Deferred revenue	(240)
Deferred income tax liabilities	(984)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net, Total	$ 15,000