Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 91,758	$ 95,546
Long-term deferred revenue	17,954	18,719
Total deferred revenue	109,712	114,265
Software license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	17,206	24,303
Long-term deferred revenue	16,690	15,407
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	63,342	62,144
Professional services and other
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	11,210	9,099
Maintenance and professional services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 1,264	$ 3,312