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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue Recognition, Milestone Method [Line Items]        
License $ 67,161 $ 61,377 $ 106,738 $ 97,079
Maintenance 60,141 62,309 119,633 124,808
Services 23,110 24,991 46,607 47,579
Total revenues 265,822 254,808 498,639 476,281
Vendor Specific Objective Evidence of Fair Value [Member]        
Revenue Recognition, Milestone Method [Line Items]        
License 1,918 5,784 3,925 12,640
Maintenance 872 2,197 1,815 4,413
Services 131 5 234 13
Total revenues $ 2,921 $ 7,986 $ 5,974 $ 17,066