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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  | $ 120,602 | $ 119,220 | $ 243,569 | $ 241,452
Sales and marketing expenses |  | 50,978 | 41,626 | 102,313 | 81,208
Provision for income taxes |  | 1,059 | 2,668 | 541 | 6,927
Net income |  | $ 4,828 | $ 9,953 | $ 6,501 | $ 25,510
Diluted earnings per share | [1] | $ 0.42 | $ 0.86 | $ 0.57 | $ 2.20
Product licenses |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  | $ 19,292 | $ 17,728 | $ 36,593 | $ 40,374
Product support |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  | $ 73,676 | 70,766 | $ 148,091 | 141,278
As Reported |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Sales and marketing expenses |  |  | 41,419 |  | 80,829
Provision for income taxes |  |  | 3,142 |  | 6,607
Net income |  |  | $ 11,076 |  | $ 25,943
Diluted earnings per share |  |  | $ 0.96 |  | $ 2.24
As Reported | Product licenses |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  |  | $ 19,118 |  | $ 40,130
As Reported | Product support |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  |  |  |  | 141,256
Effect of the Adoption | ASU 2014-09 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Sales and marketing expenses |  |  | 207 |  | 379
Provision for income taxes |  |  | (474) |  | 320
Net income |  |  | $ (1,123) |  | $ (433)
Diluted earnings per share |  |  | $ (0.10) |  | $ (0.04)
Effect of the Adoption | Product licenses | ASU 2014-09 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  |  | $ (1,390) |  | $ 244
Effect of the Adoption | Product support | ASU 2014-09 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Revenues |  |  |  |  | $ 22
[1] | Basic and fully diluted earnings per share for class A and class B common stock are the same.

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