Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 79,358	$ 73,840
Long-term deferred revenue	11,898	15,367
Total deferred revenue	91,256	89,207
Software License Arrangement
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	12,642	15,005
Long-term deferred revenue	11,307	13,532
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	59,972	50,916
Professional Services And Other
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	6,744	7,919
Maintenance And Professional Services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 591	$ 1,835