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Revenue - Financial Statement Effect of Applying ASC 606 (Income Statement) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating expenses        
Selling and marketing $ 33,160 $ 28,817 $ 65,053 $ 55,954
Other income (expense)        
Interest income 2,742 150 5,486 256
Other, net (1,677) (1,766) (1,732) (1,117)
Income tax provision        
Income tax expense (benefit) 3,764 (20,914) (188) (25,088)
Software as a service and platform as a service [Member]        
Revenues        
Total revenues 113,600 113,469 217,880 212,916
License [Member]        
Revenues        
Total revenues 45,555 54,180 73,601 113,561
Maintenance [Member]        
Revenues        
Total revenues 55,048 $ 56,009 111,707 $ 110,480
Service [Member]        
Revenues        
Total revenues 20,792   41,117  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Operating expenses        
Selling and marketing 31,923   62,269  
Other income (expense)        
Interest income 192   371  
Other, net (557)   (1,341)  
Income tax provision        
Income tax expense (benefit) 4,609   2,566  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Software as a service and platform as a service [Member]        
Revenues        
Total revenues 112,959   218,133  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | License [Member]        
Revenues        
Total revenues 50,815   94,736  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Maintenance [Member]        
Revenues        
Total revenues 56,243   112,014  
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Service [Member]        
Revenues        
Total revenues 20,725   40,754  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]        
Operating expenses        
Selling and marketing 1,237   2,784  
Other income (expense)        
Interest income 2,550   5,115  
Other, net (1,120)   (391)  
Income tax provision        
Income tax expense (benefit) (845)   (2,754)  
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 641   (253)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | License [Member]        
Revenues        
Total revenues (5,260)   (21,135)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Maintenance [Member]        
Revenues        
Total revenues (1,195)   (307)  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member]        
Revenues        
Total revenues $ 67   $ 363