Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 98,702	$ 95,546
Long-term deferred revenue	20,383	18,719
Total deferred revenue	119,085	114,265
Software license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	17,760	24,303
Long-term deferred revenue	18,595	15,407
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	69,890	62,144
Professional services and other
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	11,052	9,099
Maintenance and professional services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 1,788	$ 3,312