Condensed Consolidated Financial Statements - Revenues in Condensed Consolidated Statements of Operations from Arrangements for which Vendor-Specific Objective Evidence of Fair Value Does Not Exist for Each Undelivered Element (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue Recognition, Milestone Method [Line Items]
License	$ 33,510	$ 67,161	$ 70,933	$ 106,738
Maintenance	60,332	60,141	117,663	119,633
Services	23,823	23,110	43,399	46,607
Total revenues	219,930	265,822	445,996	498,639
Vendor Specific Objective Evidence of Fair Value [Member]
Revenue Recognition, Milestone Method [Line Items]
License	1,704	1,918	3,395	3,925
Maintenance	800	872	1,797	1,815
Services	60	131	138	234
Total revenues	$ 2,564	$ 2,921	$ 5,330	$ 5,974