Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 169,926	$ 175,647
Long-term deferred revenue	8,431	10,989
Total deferred revenue	178,357	186,636
Term license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	6,294	15,843
Perpetual license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	24,709	23,189
Long-term deferred revenue	5,833	7,909
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	111,759	112,397
Long-term deferred revenue	1,465	1,802
Cloud
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	17,677	13,604
Long-term deferred revenue	1,133	1,278
Services
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 9,487	$ 10,614