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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 |

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