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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue Recognition, Milestone Method [Line Items]        
License $ 57,653 $ 56,236 $ 154,732 $ 151,306
Maintenance 63,764 60,457 188,572 176,921
Services 28,194 30,240 75,773 81,133
Total revenues 249,644 213,939 725,925 581,766
Vendor Specific Objective Evidence of Fair Value
       
Revenue Recognition, Milestone Method [Line Items]        
License 5,466 5,653 18,106 17,013
Maintenance 1,862 2,325 6,275 7,093
Services 34   47 3
Total revenues $ 7,362 $ 7,978 $ 24,428 $ 24,109