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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
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Product licenses revenue |  | $ 17,301 | $ 22,646
Product support revenues |  | 74,415 | 70,512
Sales and marketing expenses |  | 51,335 | 39,582
Provision for income taxes |  | (518) | 4,259
Net income |  | $ 1,673 | $ 15,557
Diluted earnings per share | [1] | $ 0.15 | $ 1.34
As Reported |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Product licenses revenue |  |  | $ 21,012
Product support revenues |  |  | 70,490
Sales and marketing expenses |  |  | 39,410
Provision for income taxes |  |  | 3,465
Net income |  |  | $ 14,867
Diluted earnings per share |  |  | $ 1.28
Effect of the Adoption | ASU 2014-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Product licenses revenue |  |  | $ 1,634
Product support revenues |  |  | 22
Sales and marketing expenses |  |  | 172
Provision for income taxes |  |  | 794
Net income |  |  | $ 690
Diluted earnings per share |  |  | $ 0.06
[1] | Basic and fully diluted earnings per share for class A and class B common stock are the same.

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