Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 95,546	$ 73,840
Long-term deferred revenue	18,719	15,367
Total deferred revenue	114,265	89,207
Software License Arrangement
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	24,303	15,005
Long-term deferred revenue	15,407	13,532
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	62,144	50,916
Professional Services And Other
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	9,099	7,919
Maintenance And Professional Services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 3,312	$ 1,835