Schedule of Deferred Revenue (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 160,931	$ 175,647
Long-term deferred revenue	6,130	10,989
Total deferred revenue	167,061	186,636
Term license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	5,636	15,843
Perpetual license
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	20,844	23,189
Long-term deferred revenue	4,085	7,909
Maintenance
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	105,588	112,397
Long-term deferred revenue	828	1,802
Cloud
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	18,805	13,604
Long-term deferred revenue	1,217	1,278
Professional Services [Member]
Deferred Revenue Arrangement [Line Items]
Current deferred revenue	$ 10,058	$ 10,614