Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 104,608	$ 95,546
Long-term deferred revenue	16,029	18,719
Total deferred revenue	120,637	114,265
Software license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	17,358	24,303
Long-term deferred revenue	13,501	15,407
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	73,718	62,144
Professional services and other
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	13,532	9,099
Maintenance and professional services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 2,528	$ 3,312