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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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue Recognition, Milestone Method [Line Items]        
Software license fees $ 56,236 $ 39,560 $ 151,306 $ 127,115
Maintenance fees 60,457 47,920 176,921 141,014
Services 30,240 35,811 81,133 92,551
Total revenues 213,939 155,062 581,766 442,484
Vendor Specific Objective Evidence of Fair Value
       
Revenue Recognition, Milestone Method [Line Items]        
Software license fees 5,653 9,599 17,013 31,057
Maintenance fees 2,325 3,312 7,093 11,581
Services   118 3 750
Total revenues $ 7,978 $ 13,029 $ 24,109 $ 43,388