Revenues in 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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue Recognition, Milestone Method [Line Items]
Software license fees	$ 53,714	$ 36,645	$ 95,070	$ 87,555
Maintenance fees	57,830	49,359	116,464	93,094
Services	26,964	33,888	50,893	56,740
Total revenues	205,830	149,797	367,827	287,422
Vendor Specific Objective Evidence of Fair Value
Revenue Recognition, Milestone Method [Line Items]
Software license fees	5,559	9,799	11,360	21,458
Maintenance fees	2,447	4,273	4,768	8,269
Services		197	3	632
Total revenues	$ 8,006	$ 14,269	$ 16,131	$ 30,359