Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 155,873	$ 134,672
Long-term deferred revenue	15,805	20,859
Total deferred revenue	171,678	155,531
Software license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	40,886	38,961
Long-term deferred revenue	12,389	19,878
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	95,262	83,467
Cloud
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	8,948	4,209
Long-term deferred revenue	1,189
Services
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	10,777	8,035
Maintenance and services
Deferred Revenue Arrangement [Line Items]
Long-term deferred revenue	$ 2,227	$ 981