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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 131,917 |  | $ 122,152 |  | $ 120,602 |  | $ 122,967 |  | $ 136,381 |  | $ 126,010 |  | $ 119,220 |  | $ 122,232 |  | $ 497,638 |  | $ 503,843 |  | $ 513,589 |
Sales and marketing expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 205,525 |  | 175,045 |  | 158,281 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,019) |  | 53,279 |  | 22,694 |
Net income | $ 3,301 |  | $ 12,699 |  | $ 4,828 |  | $ 1,673 |  | $ (25,499) |  | $ 18,184 |  | $ 9,953 |  | $ 15,557 |  | $ 22,501 |  | $ 18,195 |  | $ 92,239 |
Diluted earnings per share | $ 0.30 | [1] | $ 1.10 | [1] | $ 0.42 | [1] | $ 0.15 | [1] | $ (2.23) | [1] | $ 1.58 | [1] | $ 0.86 | [1] | $ 1.34 | [1] | $ 1.97 | [1],[2] | $ 1.58 | [1],[2] | $ 8.01 | [2]
As Reported | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 174,612 |  | $ 158,740 |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 54,964 |  | 22,138 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,643 |  | $ 90,908 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.53 |  | $ 7.89 |
Effect of the Adoption | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales and marketing expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 433 |  | $ (459) |
Provision for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,685) |  | 556 |
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 552 |  | $ 1,331 |
Diluted earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.05 |  | $ 0.12 |
Product licenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,057 |  | $ 93,259 |  | $ 114,874 |
Product licenses | As Reported | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,969 |  | 113,503 |
Product licenses | Effect of the Adoption | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (710) |  | 1,371 |
Product support |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 296,216 |  | 289,184 |  | 285,136 |
Product support | As Reported | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 289,174 |  | 285,079 |
Product support | Effect of the Adoption | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  | $ 57 |
[1] | The sum of the basic and diluted earnings (loss) per share for the four quarters may differ from annual earnings per share as the weighted-average shares outstanding are computed independently for each of the quarters presented.
[2] | Basic and fully diluted earnings per share for class A and class B common stock are the same.

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