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Revenue - Financial Statement Effect of Applying ASC 606 (Income Statement) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Operating expenses        
Selling and marketing $ 28,252 $ 25,236 $ 93,305 $ 81,190
Other income (expense)        
Interest income 2,763 165 8,249 421
Other, net (1,304) (1,059) (3,036) (2,176)
Income tax provision        
Income tax expense (benefit) 2,012 (2,233) 1,824 (27,321)
Software as a service and platform as a service [Member]        
Revenues        
Total revenues 104,519 99,761 322,399 312,677
License [Member]        
Revenues        
Total revenues 68,964 50,017 142,565 163,578
Maintenance [Member]        
Revenues        
Total revenues 54,373 $ 56,349 166,080 $ 166,829
Service [Member]        
Revenues        
Total revenues 17,669   58,786  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Operating expenses        
Selling and marketing 26,397   88,667  
Other income (expense)        
Interest income 230   601  
Other, net (1,155)   (2,495)  
Income tax provision        
Income tax expense (benefit) 2,804   5,371  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Software as a service and platform as a service [Member]        
Revenues        
Total revenues 103,764   321,897  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | License [Member]        
Revenues        
Total revenues 69,052   163,788  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Maintenance [Member]        
Revenues        
Total revenues 54,659   166,673  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service [Member]        
Revenues        
Total revenues 18,184   58,938  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Operating expenses        
Selling and marketing 1,855   4,638  
Other income (expense)        
Interest income 2,533   7,648  
Other, net (149)   (541)  
Income tax provision        
Income tax expense (benefit) (792)   (3,547)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Software as a service and platform as a service [Member]        
Revenues        
Total revenues 755   502  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | License [Member]        
Revenues        
Total revenues (88)   (21,223)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Maintenance [Member]        
Revenues        
Total revenues (286)   (593)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member]        
Revenues        
Total revenues $ (515)   $ (152)