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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) |  |

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