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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
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.