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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues:                      
Software license fees $ 60,762 $ 39,249 $ 46,085 $ 43,724 $ 66,039 $ 37,804 $ 31,399 $ 29,317 $ 189,820 $ 164,559 $ 154,517
Maintenance fees 39,164 36,928 37,195 35,070 35,414 32,480 34,207 33,422 148,357 135,523 130,922
Services 21,956 23,770 18,673 15,371 26,745 15,439 17,187 14,618 79,770 73,989 80,146
Software hosting fees 13,155 12,202 11,413 10,378 13,043 11,294 9,630 10,386 47,148 44,353 40,170
Total revenues 135,037 112,149 113,366 104,543 141,241 97,017 92,423 87,743 465,095 418,424 405,755
Expenses:                      
Cost of software license fees 4,077 [1] 3,763 [1] 4,136 [1] 3,442 [1] 3,322 [2] 3,088 [2] 3,107 [2] 3,074 [2] 15,418 [2] 12,591 [2] 14,754 [2]
Cost of maintenance, services and hosting fees 27,445 [1] 29,996 [1] 31,818 [1] 29,607 [1] 30,981 [2] 28,956 [2] 29,303 [2] 27,892 [2] 118,866 [2] 117,132 [2] 112,893 [2]
Research and development 20,781 22,481 23,784 23,130 18,717 18,165 18,798 18,396 90,176 74,076 77,506
Selling and marketing 20,023 19,814 21,791 19,294 19,786 17,933 15,989 16,845 80,922 70,553 61,799
General and administrative 20,191 19,068 15,804 16,362 20,558 16,341 15,735 17,462 71,425 70,096 79,244
Depreciation and amortization 5,477 5,759 5,611 5,210 5,078 5,146 5,125 4,979 22,057 20,328 17,989
Total expenses 97,994 100,881 102,944 97,045 98,442 89,629 88,057 88,648 398,864 364,776 364,185
Operating income (loss) 37,043 11,268 10,422 7,498 42,799 7,388 4,366 (905) 66,231 53,648 41,570
Other income (expense):                      
Interest income 676 205 196 238 230 185 126 124 1,315 665 1,042
Interest expense (1,008) (406) (374) (643) (514) (418) (541) (523) (2,431) (1,996) (2,856)
Other, net (714) (46) 260 (302) (163) (1,556) (1,682) (214) (802) (3,615) (6,648)
Total other income (expense) (1,046) (247) 82 (707) (447) (1,789) (2,097) (613) (1,918) (4,946) (8,462)
Income (loss) before income taxes 35,997 11,021 10,504 6,791 42,352 5,599 2,269 (1,518) 64,313 48,702 33,108
Income tax expense 12,106 482 704 5,169 15,254 3,263 2,419 571 18,461 21,507 13,482
Net income (loss) $ 23,891 $ 10,539 $ 9,800 $ 1,622 $ 27,098 $ 2,336 $ (150) $ (2,089) $ 45,852 $ 27,195 $ 19,626
Earnings (loss) per share                      
Basic $ 0.71 [3] $ 0.31 [3] $ 0.29 [3] $ 0.05 [3] $ 0.82 [4] $ 0.07 [4] $ 0.00 [4] $ (0.06) [4] $ 1.37 $ 0.81 $ 0.57
Diluted $ 0.70 $ 0.31 $ 0.29 $ 0.05 $ 0.80 [4] $ 0.07 [4] $ 0.00 [4] $ (0.06) [4] $ 1.34 $ 0.80 $ 0.57
[1] The cost of software license fees excludes 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 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.
[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.
[4] The sum of the earnings per share by quarter does not agree to the earnings per share for the year ended December 31, 2010 due to rounding.