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Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:                      
Software license fees $ 94,731 $ 39,560 $ 36,645 $ 50,910 $ 60,762 $ 39,249 $ 46,085 $ 43,724 $ 221,846 $ 189,820 $ 164,559
Maintenance fees 58,862 47,920 49,359 43,735 39,164 36,928 37,195 35,070 199,876 148,357 135,523
Services 38,985 35,811 33,888 22,852 21,956 23,770 18,673 15,371 131,536 79,770 73,989
Software hosting fees 31,517 31,771 29,905 20,128 13,155 12,202 11,413 10,378 113,321 47,148 44,353
Total revenues 224,095 155,062 149,797 137,625 135,037 112,149 113,366 104,543 666,579 465,095 418,424
Expenses:                      
Cost of software license fees 6,968 [1] 5,874 [1] 5,818 [1] 4,932 [1] 4,077 [1] 3,763 [1] 4,136 [1] 3,442 [1] 23,592 [1] 15,418 [1] 12,591 [1]
Cost of maintenance, services and hosting fees 53,502 [1] 51,944 [1] 55,715 [1] 40,891 [1] 27,445 [1] 29,996 [1] 31,818 [1] 29,607 [1] 202,052 [1] 118,866 [1] 117,132 [1]
Research and development 33,586 34,213 35,027 30,933 20,781 22,481 23,784 23,130      
Selling and marketing 22,730 20,448 23,178 20,698 20,023 19,814 21,791 19,294 87,054 80,922 70,553
General and administrative 21,616 24,533 28,236 34,362 20,191 19,068 15,804 16,362 108,747 71,425 70,096
Depreciation and amortization 10,158 9,742 9,681 7,422 5,477 5,759 5,611 5,210 37,003 22,057 20,328
Total expenses 148,560 146,754 157,655 139,238 97,994 100,881 102,944 97,045 592,207 398,864 364,776
Operating income (expense) 75,535 8,308 (7,858) (1,613) 37,043 11,268 10,422 7,498 74,372 66,231 53,648
Other income (expense):                      
Interest income 209 222 234 249 676 205 196 238 914 1,315 665
Interest expense (3,031) (2,620) (2,875) (1,891) (1,008) (406) (374) (643) (10,417) (2,431) (1,996)
Other, net 1,298 (1,430) (347) 878 (714) (46) 260 (302) 399 (802) (3,615)
Total other income (expense) (1,524) (3,828) (2,988) (764) (1,046) (247) 82 (707) (9,104) (1,918) (4,946)
Income (loss) before income taxes 74,011 4,480 (10,846) (2,377) 35,997 11,021 10,504 6,791 65,268 64,313 48,702
Income tax expense 24,347 (1,175) (6,195) (555) 12,106 482 704 5,169 16,422 18,461 21,507
Net income $ 49,664 $ 5,655 $ (4,651) $ (1,822) $ 23,891 $ 10,539 $ 9,800 $ 1,622 $ 48,846 $ 45,852 $ 27,195
Earnings (loss) per share                      
Basic $ 1.26 [2] $ 0.14 [2] $ (0.12) [2] $ (0.05) [2] $ 0.71 [3] $ 0.31 [3] $ 0.29 [3] $ 0.05 [3] $ 1.26 $ 1.37 $ 0.81
Diluted $ 1.24 [2] $ 0.14 [2] $ (0.12) [2] $ (0.05) [2] $ 0.70 $ 0.31 $ 0.29 $ 0.05 $ 1.22 $ 1.34 $ 0.80
[1] The cost of software license fees excludes charges for depreciation but includes amortization of purchased and developed software for resale. The cost of maintenance, services and hosting fees excludes charges for depreciation.
[2] The sum of the earnings per share by quarter does not agree to the earnings per share for the year ended December 31, 2012 due to rounding.
[3] The sum of the earnings per share by quarter does not agree to the earnings per share for the year ended December 31, 2011 due to rounding.