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Revenues in Consolidated Statements of Income 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 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenue Recognition, Milestone Method [Line Items]                      
Software license fees $ 82,625 $ 56,236 $ 53,714 $ 41,356 $ 94,731 $ 39,560 $ 36,645 $ 50,910 $ 233,931 $ 221,846 $ 189,820
Maintenance fees 69,033 60,457 57,830 58,634 58,862 47,920 49,359 43,735 245,954 199,876 148,357
Services 40,952 30,240 26,964 23,929 38,985 35,811 33,888 22,852 122,085 131,536 79,770
Total revenues 283,162 213,939 205,830 161,997 224,095 155,062 149,797 137,625 864,928 666,579 465,095
Vendor Specific Objective Evidence of Fair Value
                     
Revenue Recognition, Milestone Method [Line Items]                      
Software license fees                 22,190 38,226 66,939
Maintenance fees                 9,649 14,178 16,801
Services                 10 830 1,362
Total revenues                 $ 31,849 $ 53,234 $ 85,102