Deferred Revenue - Schedule of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 59,580	$ 61,149
Deferred revenue, current portion	56,100	49,368
Deferred revenue, Non-current portion	3,480	11,781
License software [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	15,600	18,375
Subscription and maintenance support [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	37,351	35,853
Professional services and other [Member]
Deferred Revenue Arrangement [Line Items]
Deferred revenue	$ 6,629	$ 6,921