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Revenue - Financial Statement Effect of Applying ASC 606 (Income Statement) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues                      
Total revenues $ 319,950 $ 245,525 $ 234,995 $ 209,310 $ 326,395 $ 225,735 $ 240,599 $ 231,462 $ 1,009,780 $ 1,024,191 $ 1,005,701
Operating expenses                      
Selling and marketing 24,576 28,252 33,160 31,893 26,695 25,236 28,817 27,137 117,881 107,885 118,082
Other income (expense)                      
Interest income 2,893 2,763 2,742 2,744 143 165 150 106 11,142 564 530
Other, net (688) (1,304) (1,677) (55) (443) (1,059) (1,766) 649 (3,724) (2,619) 4,105
Income tax provision                      
Income tax expense (benefit) 21,054 2,012 3,764 (3,952) 65,758 (2,233) (20,914) (4,174) 22,878 38,437 56,046
Software as a service and platform as a service [Member]                      
Revenues                      
Total revenues 110,626 104,519 113,600 104,280 112,895 99,761 113,469 99,447 433,025 425,572 411,289
License [Member]                      
Revenues                      
Total revenues 137,991 68,964 45,555 28,046 129,546 50,017 54,180 59,381 280,556 293,124 273,466
Maintenance [Member]                      
Revenues                      
Total revenues $ 53,065 $ 54,373 $ 55,048 $ 56,659 $ 55,242 $ 56,349 $ 56,009 $ 54,471 219,145 $ 222,071 $ 233,476
Services [Member]                      
Revenues                      
Total revenues                 77,054    
Without Application of ASC 606 [Member]                      
Operating expenses                      
Selling and marketing                 110,417    
Other income (expense)                      
Interest income                 831    
Other, net                 (3,274)    
Income tax provision                      
Income tax expense (benefit)                 22,981    
Without Application of ASC 606 [Member] | Software as a service and platform as a service [Member]                      
Revenues                      
Total revenues                 432,095    
Without Application of ASC 606 [Member] | License [Member]                      
Revenues                      
Total revenues                 281,355    
Without Application of ASC 606 [Member] | Maintenance [Member]                      
Revenues                      
Total revenues                 221,189    
Without Application of ASC 606 [Member] | Services [Member]                      
Revenues                      
Total revenues                 77,595    
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member]                      
Operating expenses                      
Selling and marketing                 7,464    
Other income (expense)                      
Interest income                 10,311    
Other, net                 (450)    
Income tax provision                      
Income tax expense (benefit)                 (103)    
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] | Software as a service and platform as a service [Member]                      
Revenues                      
Total revenues                 930    
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] | License [Member]                      
Revenues                      
Total revenues                 (799)    
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] | Maintenance [Member]                      
Revenues                      
Total revenues                 (2,044)    
Effect of Change - Higher/(Lower) [Member] | Accounting Standards Update 2014-09 [Member] | Services [Member]                      
Revenues                      
Total revenues                 $ (541)