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, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue Recognition, Milestone Method [Line Items]
Software license fees	$ 61,377	$ 53,714	$ 97,079	$ 95,070
Maintenance fees	62,309	57,830	124,808	116,464
Services	24,991	26,964	47,579	50,893
Total revenues	254,808	205,830	476,281	367,827
Vendor Specific Objective Evidence of Fair Value
Revenue Recognition, Milestone Method [Line Items]
Software license fees	5,784	5,559	12,640	11,360
Maintenance fees	2,197	2,447	4,413	4,768
Services	5		13	3
Total revenues	$ 7,986	$ 8,006	$ 17,066	$ 16,131